Set DisableNerdbankGitVersioningInMiniEditor=true on the MiniEditor.csproj ProjectReference

This makes sure that NBGV doesn't run as part of the VSMac build, setting the VSMac build version

Tests/MonoDevelop.Xml.Tests.csproj

@@ -10,7 +10,9 @@
   <ItemGroup>
     <ProjectReference Include="..\Editor\MonoDevelop.Xml.Editor.csproj" />
     <ProjectReference Include="..\Core\MonoDevelop.Xml.Core.csproj" />
-    <ProjectReference Include="..\external\MiniEditor\Microsoft.VisualStudio.MiniEditor\Microsoft.VisualStudio.MiniEditor.csproj" />
+    <ProjectReference Include="..\external\MiniEditor\Microsoft.VisualStudio.MiniEditor\Microsoft.VisualStudio.MiniEditor.csproj">
+      <Properties>DisableNerdbankGitVersioningInMiniEditor=true</Properties>
+    </ProjectReference>
   </ItemGroup>
   <ItemGroup>
     <Compile Remove="Schema\SchemaAssociationTests.cs" />