Remove space from path to exclude TestUtilities directory in the Test nuget package

Author: CDiaz-MS

Assets/MixedRealityToolkit.Tests/MixedReality.Toolkit.Tests.nuspec

@@ -23,7 +23,7 @@
   </metadata>
   <files>
     <!-- Test Utilities is excluded because there is a separate utilities package -->
-    <file src="**" exclude="*.nuspec;*.nuspec.meta;*.props;*.props.meta;*.targets;*.targets.meta; TestUtilities\**" target="MRTK\" />
+    <file src="**" exclude="*.nuspec;*.nuspec.meta;*.props;*.props.meta;*.targets;*.targets.meta;TestUtilities\**" target="MRTK\" />
 
     <!-- Reuse MixedReality.Toolkit.targets, as the MSBuild logic is the same for all MRTK nuget packages. -->
     <file src="..\MixedRealityToolkit\MixedReality.Toolkit.targets" target="build\Microsoft.MixedReality.Toolkit.Tests.targets" />