[monotouch-test] Fix a few issues when running the .NET version of monotouch-test on device. (#10419)

* [monotouch-test] Fix conditional compilation constants when building for device.

* [tests/monotouch-test] Don't use entitlements when building monotouch-test for device.

tests/monotouch-test/dotnet/iOS/monotouch-test.csproj

@@ -11,9 +11,10 @@
     <SignAssembly>True</SignAssembly>
     <AssemblyOriginatorKeyFile>..\..\..\..\product.snk</AssemblyOriginatorKeyFile>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
-    <CodesignEntitlements>..\..\Entitlements.plist</CodesignEntitlements>
+    <CodesignEntitlements Condition="'$(Platform)' == 'iPhoneSimulator'">..\..\Entitlements.plist</CodesignEntitlements>
     <AssetTargetFallback>xamarinios10;$(AssetTargetFallback)</AssetTargetFallback>
     <DefineConstants Condition="'$(Platform)' == 'iPhoneSimulator'">$(DefineConstants);DYNAMIC_REGISTRAR</DefineConstants>
+    <DefineConstants Condition="'$(Platform)' != 'iPhoneSimulator'">$(DefineConstants);DEVICE</DefineConstants>
     <RootTestsDirectory>..\..\..</RootTestsDirectory>
   </PropertyGroup>