Remove unnecessary newline at the end of the webapiaot csproj

[sander1095]

Remove unnecessary newline at the end of the webapiaot csproj

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This PR removes a lingering newline at the end of the webapiaot csproj

Description

In #60337 I added OpenAPI support to the dotnet new webapiaot template. This adds the Microsoft.AspNetCore.OpenApi package by default.

I just tested this locally by installing the preview4 build. I saw that the .csproj has an extra newline at the end, before the </project> tag. The dotnet new webapi template doesn't have this, which means this is a bit inconsistent

I removed this extra newline in this PR to ensure both templates behave the same way.

Fixes #59564

[sander1095]

Hi @captainsafia ! Perhaps you can have a quick peek at this 1LOC PR change :)

[captainsafia]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 3 pipeline(s).

[sander1095]

The failing tests seems to have nothing to do with my changes. I think it's simply a flaky test?

I think a new /azp run is needed.

[captainsafia]

@wtgodbe Any chance you can use your powers to merge this whitespace change?