Do not close on select if Ctrl or Meta (Cmd) keys are being held as described in #3400 (#5222)

Fixes #3400

src/js/select2/dropdown/closeOnSelect.js

@@ -21,7 +21,7 @@ define([
     var originalEvent = evt.originalEvent;
 
     // Don't close if the control key is being held
-    if (originalEvent && originalEvent.ctrlKey) {
+    if (originalEvent && (originalEvent.ctrlKey || originalEvent.metaKey)) {
       return;
     }