Fix nuspec that contained x86

nuget/AppCenterCrashes.nuspec

@@ -41,6 +41,6 @@
 
     <!-- UWP -->
     <file src="$uwp_dir$/Microsoft.AppCenter.Crashes.dll" target="lib/uap10.0" />
-    <file src="$uwp_dir$/x86/Microsoft.AppCenter.Crashes.xml" target="lib/uap10.0" />
+    <file src="$uwp_dir$/Microsoft.AppCenter.Crashes.xml" target="lib/uap10.0" />
   </files>
 </package>