iOS: Remove didAddSubview override in NSWindow, its code breaks things which rely on focus changing within SDL's UIWindow (bug #4659).

src/video/uikit/SDL_uikitwindow.m

@@ -67,20 +67,6 @@
 
 @implementation SDL_uikitwindow
 
-- (void)didAddSubview:(UIView *)subview
-{
-	[super didAddSubview:subview];
-	// We need to pach the enabled state in subviews as a Metal view gets added and covers up the SDL_uikitview that handles touch.
-	// So set needs layout so that the layout gets done (which is where we patch the flags) Johna.
-    NSArray<UIView*>* subviews = self.subviews;
-	for (int i=0; i<[subviews count]; i++)
-	{
-		UIView *view = [subviews objectAtIndex:i];
-		// NSLog( @"View %p enabled %d\n", view, view.userInteractionEnabled );
-		[view setNeedsLayout];  // force the subviews to layout.
-	}
-}
-
 - (void)layoutSubviews
 {
     /* Workaround to fix window orientation issues in iOS 8+. */