Fix MusicStore RootPath

build/submodules.props

@@ -43,7 +43,7 @@
 
     <!-- Test-only repos -->
     <Repository Include="AuthSamples" PatchPolicy="AlwaysUpdateAndCascadeVersions" />
-    <Repository Include="MusicStore" RootPath="$(RepositoryRoot)src\MusicStore" PatchPolicy="AlwaysUpdateAndCascadeVersions" />
+    <Repository Include="MusicStore" RootPath="$(RepositoryRoot)src\MusicStore\" PatchPolicy="AlwaysUpdateAndCascadeVersions" />
     <Repository Include="ServerTests" PatchPolicy="AlwaysUpdateAndCascadeVersions" />
   </ItemGroup>