More script fixes (#2419)

Task/Issue URL: https://app.asana.com/0/1203301625297703/1206468110851824/f

Description:

- set initial build number to -1 since we always increment it,
- set version only for hotfix branch, otherwise we get it from the user input

fastlane/Fastfile

@@ -148,7 +148,7 @@ lane :latest_build_number_for_version do |options|
   build_number = latest_testflight_build_number(
     api_key: get_api_key,
     version: options[:version],
-    initial_build_number: 0,
+    initial_build_number: -1,
     username: get_username(options))
   if options[:file_name]
     File.write(options[:file_name], build_number)

scripts/prepare_release.sh

@@ -171,8 +171,8 @@ create_build_branch() {
 update_marketing_version() {
 	printf '%s' "Setting app version ... "
 
-	version=$(cut -d' ' -f3 < "${base_dir}/Configuration/Version.xcconfig")
 	if [[ $is_hotfix ]]; then
+		version=$(cut -d' ' -f3 < "${base_dir}/Configuration/Version.xcconfig")
 		version=$(bump_patch_number "$version")
 	fi