Reinstate ignored source control tests

Author: Hosch250

RubberduckTests/RubberduckTests.csproj

@@ -137,6 +137,7 @@
     <Compile Include="SourceControlConfig.cs" />
     <Compile Include="SourceControl\BranchesViewModelTests.cs" />
     <Compile Include="SourceControl\ChangesViewModelTests.cs" />
+    <Compile Include="SourceControl\SourceControlTests.cs" />
     <Compile Include="StringExtensionsTests.cs" />
     <Compile Include="TodoControllerTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />