Remove csharp from project paths in sln

Author: FreePhoenix888

csharp/Platform.Threading.sln

@@ -3,9 +3,9 @@ Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 16
 VisualStudioVersion = 16.0.29020.237
 MinimumVisualStudioVersion = 10.0.40219.1
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Platform.Threading", "csharp\Platform.Threading\Platform.Threading.csproj", "{F7E3F718-E566-4358-9958-CF0E5730B6A6}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Platform.Threading", "Platform.Threading\Platform.Threading.csproj", "{F7E3F718-E566-4358-9958-CF0E5730B6A6}"
 EndProject
-Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Platform.Threading.Tests", "csharp\Platform.Threading.Tests\Platform.Threading.Tests.csproj", "{0DA6066D-905B-4045-89E8-51C857891DE4}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Platform.Threading.Tests", "Platform.Threading.Tests\Platform.Threading.Tests.csproj", "{0DA6066D-905B-4045-89E8-51C857891DE4}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution