macosx: fixed playlist and close entries in the Window menu (close #6239)

the playlist item automatically reveals the main window now, in case it is hidden. the close item correctly closes the detached video output window now, when using the gray ui style
(cherry picked from commit 77956b05)

modules/gui/macosx/MainWindow.m

@@ -635,6 +635,11 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
 - (IBAction)togglePlaylist:(id)sender
 {
+    if (![self isVisible])
+    {
+        [self makeKeyAndOrderFront: sender];
+    }
+
     BOOL b_activeVideo = [[VLCMain sharedInstance] activeVideoPlayback];
 
     if ( !b_splitview_removed && ( (([[NSApp currentEvent] modifierFlags] & NSAlternateKeyMask) != 0 && !b_activeVideo) || (b_nonembedded && b_activeVideo && sender != nil) ))
@@ -2249,7 +2254,10 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
 - (void)performClose:(id)sender
 {
+    if (b_dark_interface)
         [[VLCMainWindow sharedInstance] performClose: sender];
+    else
+        [super performClose: sender];
 }
 
 - (void)performMiniaturize:(id)sender