Update Xamarin.Android.Common.targets

Fixes:

    error MSB4096: The item "obj/Release/android/assets/monodroid_corlib_test.dll" in item list "_ResolvedUserAssemblies" does not define a value for metadata "TargetFrameworkIdentifier".  In order to use this metadata, either qualify it by specifying %(_ResolvedUserAssemblies.TargetFrameworkIdentifier), or ensure that all items in this list define a value for this metadata.

Author: jonathanpeppers

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets

@@ -2297,7 +2297,7 @@ because xbuild doesn't support framework reference assemblies.
 
   <CreateItem
     Include="@(_ResolvedUserAssemblies)"
-    Condition="'%(TargetFrameworkIdentifier)' == 'MonoAndroid'">
+    Condition="'%(_ResolvedUserAssemblies.TargetFrameworkIdentifier)' == 'MonoAndroid'">
     <Output TaskParameter="Include" ItemName="_ResolvedUserMonoAndroidAssemblies" />
   </CreateItem>
 </Target>