When deleting set modal to false so editor can resume

Author: Joe Wegner

app/src/cc/arduino/view/NotificationPopup.java

@@ -252,6 +252,7 @@ public void close() {
     if (autoClose) {
       autoCloseTimer.cancel();
     }
+    setModal(false);
     dispatchEvent(new WindowEvent(this, WindowEvent.WINDOW_CLOSING));
   }