consider cmd key as prefix to block cmd-q from asking to catchup anything

tt-rss.js

@@ -1001,10 +1001,12 @@ function hotkey_handler(e) {
 
 		if (keycode == 16) return; // ignore lone shift
 
-		if ((keycode == 70 || keycode == 67 || keycode == 71) && !hotkey_prefix) {
+		if ((keycode == 70 || keycode == 67 || keycode == 71 || 
+				keycode == 224 || keycode == 91) && !hotkey_prefix) {
+
 			hotkey_prefix = keycode;
 			debug("KP: PREFIX=" + keycode + " CHAR=" + keychar);
-			return;
+			return true;
 		}
 
 		if (Element.visible("hotkey_help_overlay")) {