remove unused synthesized methodQueue ivars (#232)

Summary:
X-link: facebook/react-native#39548

Pull Request resolved: #232

Changelog: [Internal]

these aren't used, delete. i checked that no one else is trying to get the methodQueue of these modules as well.

Differential Revision: D49440924

fbshipit-source-id: bbd329a066f36290ef13f773aeec22fe513bda15

react-native-pytorch-core/ios/Jsi/PyTorchCoreJSI.mm

@@ -22,7 +22,6 @@ - (void)invokeAsync:(std::function<void()> &&)func;
 @implementation PyTorchCoreJSI
 
 @synthesize bridge = _bridge;
-@synthesize methodQueue = _methodQueue;
 
 RCT_EXPORT_MODULE()