Remove invalidate observer instead of re-adding observer in DeviceInfo module (#43737)

Summary:
Previous fix brings in https://github.com/facebook/react-native/pull/42396. Seems it's a mistake to re-add observer?
So let's remove it and also not `invalidate` method not be called twice.

[IOS] [FIXED] - Remove invalidate observer instead of re-adding observer in DeviceInfo module

Pull Request resolved: https://github.com/facebook/react-native/pull/43737

Test Plan: Fix for https://github.com/facebook/react-native/issues/42120 also works.

Reviewed By: javache

Differential Revision: D55692219

Pulled By: cipolleschi

fbshipit-source-id: dba1ddc39a9f2611fc2b84fadf8c23827891379a

packages/react-native/React/CoreModules/RCTDeviceInfo.mm

@@ -89,6 +89,9 @@ RCT_EXPORT_MODULE()
 
 - (void)invalidate
 {
+  if (_invalidated) {
+    return;
+  }
   _invalidated = YES;
   [self _cleanupObservers];
 }
@@ -109,10 +112,7 @@ RCT_EXPORT_MODULE()
 
   [[NSNotificationCenter defaultCenter] removeObserver:self name:RCTWindowFrameDidChangeNotification object:nil];
 
-  [[NSNotificationCenter defaultCenter] addObserver:self
-                                           selector:@selector(invalidate)
-                                               name:RCTBridgeWillInvalidateModulesNotification
-                                             object:nil];
+  [[NSNotificationCenter defaultCenter] removeObserver:self name:RCTBridgeWillInvalidateModulesNotification object:nil];
 }
 
 static BOOL RCTIsIPhoneNotched()