macosx: don't show the playlist on stop in minimized mode (refs #6213)

(cherry picked from commit 23d75555)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/macosx/MainWindow.m

@@ -598,6 +598,7 @@ static VLCMainWindow *_o_sharedInstance = nil;
     {
         if (b_splitview_removed)
         {
+            if( !b_nonembedded ||( sender != nil && b_nonembedded))
                 [self showSplitView];
         }