fix macOS change in [NSView isDecendantOf:]

now the call returns true if you set the argument to the same view

vstgui/lib/platform/mac/cocoa/nsviewframe.mm

@@ -329,7 +329,7 @@ static BOOL resignFirstResponder (id self, SEL _cmd)
 			firstResponder = nil;
 		if (firstResponder)
 		{
-			if ([firstResponder isDescendantOf:self])
+			if (firstResponder != self && [firstResponder isDescendantOf:self])
 			{
 				return YES;
 			}