Fix: build fails on linux because of wrong dir separator

[PoisonousJohn]

Hi. We have a build failing on Linux build agents due to wrong directory separtor. Here's the fix.

PR contains some whitespace changes, if you don't mind

Example of exception

[18:44:41]E:				 [BuildPipeline.BuildPlayer()] [EXCEPTION] FileNotFoundException: Could not find file "Code/Library/Bee/Android/Prj/IL2CPP/Gradle/unityLibrary/src\main\java\com\unity3d\player\UnityPlayerActivity.java"
[18:44:41] :				 [BuildPipeline.BuildPlayer()] FileNotFoundException: Could not find file "Code/Library/Bee/Android/Prj/IL2CPP/Gradle/unityLibrary/src\main\java\com\unity3d\player\UnityPlayerActivity.java"
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.Boolean anonymous, System.IO.FileOptions options) [0x0019e] in <6b6c247d47d645b790f8ec1a6fff97f8>:0
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at System.IO.FileStream..ctor (System.String path, System.IO.FileMode mode, System.IO.FileAccess access, System.IO.FileShare share, System.Int32 bufferSize, System.IO.FileOptions options) [0x00000] in <6b6c247d47d645b790f8ec1a6fff97f8>:0
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at (wrapper remoting-invoke-with-check) System.IO.FileStream..ctor(string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare,int,System.IO.FileOptions)
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks, System.Int32 bufferSize) [0x00055] in <6b6c247d47d645b790f8ec1a6fff97f8>:0
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at System.IO.StreamReader..ctor (System.String path, System.Text.Encoding encoding, System.Boolean detectEncodingFromByteOrderMarks) [0x00000] in <6b6c247d47d645b790f8ec1a6fff97f8>:0
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at (wrapper remoting-invoke-with-check) System.IO.StreamReader..ctor(string,System.Text.Encoding,bool)
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at System.IO.File.InternalReadAllText (System.String path, System.Text.Encoding encoding) [0x00000] in <6b6c247d47d645b790f8ec1a6fff97f8>:0
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at System.IO.File.ReadAllText (System.String path) [0x0002c] in <6b6c247d47d645b790f8ec1a6fff97f8>:0
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at PostProcessor.ReplaceLineInFile (System.String path, System.String oldValue, System.String newValue) [0x00000] in Code/Library/PackageCache/[email protected]/Editor/PostProcessor.cs:82
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at DidomiPostProcessorGradleAndroidProject.UpdateUnityPlayerActivity (System.String path) [0x000a0] in Code/Library/PackageCache/[email protected]/Editor/PostProcessor.cs:62
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at DidomiPostProcessorGradleAndroidProject.AndroidPostProcess (System.String path) [0x00000] in Code/Library/PackageCache/[email protected]/Editor/PostProcessor.cs:27
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at DidomiPostProcessorGradleAndroidProject.OnPostGenerateGradleAndroidProject (System.String path) [0x00015] in Code/Library/PackageCache/[email protected]/Editor/PostProcessor.cs:18
[18:44:41] :				 [BuildPipeline.BuildPlayer()] at UnityEditor.Android.AndroidBuildPipelineInterfaces.OnGeneratePlatformProjectPostprocess (System.String path, System.Boolean strict) [0x00026] in /home/bokken/build/output/unity/unity/Editor/Mono/BuildPipeline/Android/AndroidPostGenerateGradleProject.cs:39

[PoisonousJohn]

@pmerlet-at-didomi could you please take a look?

[pmerlet-at-didomi]

Hello @PoisonousJohn , thanks for you fix. PR looks good to me, we will make sure the change is present in the next release.
If you can remove the whitespace changes from the PR we will integrate it directly, otherwise we will cherry-pick the change from our repository.

[PoisonousJohn]

@pmerlet-at-didomi the whitespace problem is fixed