macosx: fix lion fullscreen button in dark ui in some cases

Especially this is needed when fullscreen is true in video prefs, but video has not started yet.
(cherry picked from commit a0000ece)
Signed-off-by: David Fuhrmann <david.fuhrmann@googlemail.com>

modules/gui/macosx/MainWindowTitle.m

@@ -174,7 +174,17 @@
     else if (sender == o_green_btn)
         [[self window] performZoom: sender];
     else if (sender == o_fullscreen_btn)
-        [[VLCCoreInteraction sharedInstance] toggleFullscreen];
+    {
+        // set fs directly to true, as the vars can be already true in some configs
+        var_SetBool( pl_Get( VLCIntf ), "fullscreen", true );
+
+        vout_thread_t *p_vout = getVout();
+        if( p_vout )
+        {
+            var_SetBool( p_vout, "fullscreen", true );
+            vlc_object_release( p_vout );
+        }    
+    }
     else
         msg_Err( VLCIntf, "unknown button action sender" );