do not call [super loadView] in RN's UIViewController (facebook#45312)

Summary:
Pull Request resolved: facebook#45312

changelog: [internal]

loadview shouldn't call its super method. Even though it isn't broken now, the official docs recommend against it.

https://developer.apple.com/documentation/uikit/uiviewcontroller/1621454-loadview

Reviewed By: christophpurrer

Differential Revision: D59376105

fbshipit-source-id: ee04020c008a3f208aafc79991c6ff24a71b226f

packages/react-native/React/Fabric/Mounting/ComponentViews/Modal/RCTFabricModalHostViewController.mm

@@ -38,7 +38,7 @@ - (void)viewDidLayoutSubviews
 
 - (void)loadView
 {
-  [super loadView];
+  self.view = [UIView new];
   [_touchHandler attachToView:self.view];
 }