Popups don't accept first focus clicks

I'm not sure if this is is what we want, but it matches Windows behavior

src/video/cocoa/SDL_cocoawindow.m

@@ -1646,11 +1646,10 @@ static int Cocoa_SendMouseButtonClicks(SDL_Mouse *mouse, NSEvent *theEvent, SDL_
 
 - (BOOL)acceptsFirstMouse:(NSEvent *)theEvent
 {
-    if (SDL_GetHint(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH)) {
-        return SDL_GetHintBoolean(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, SDL_FALSE);
-    } else {
-        return SDL_GetHintBoolean("SDL_MAC_MOUSE_FOCUS_CLICKTHROUGH", SDL_FALSE);
+    if (SDL_WINDOW_IS_POPUP(data->window)) {
+        return NO;
     }
+    return SDL_GetHintBoolean(SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH, SDL_FALSE);
 }
 
 @end