[WatchKitCatalog] Fixed up WatchApp arch

WatchKit/WatchKitCatalog/WatchApp/WatchApp.csproj

@@ -56,12 +56,11 @@
     <OutputPath>bin\iPhone\Release</OutputPath>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
-    <MtouchArch>ARMv7, ARM64</MtouchArch>
+    <MtouchArch>ARMv7k</MtouchArch>
     <ConsolePause>false</ConsolePause>
     <CodesignKey>iPhone Distribution</CodesignKey>
     <MtouchUseRefCounting>true</MtouchUseRefCounting>
-    <MtouchI18n>
-    </MtouchI18n>
+    <MtouchI18n></MtouchI18n>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />