Qt: Hide "Go to Packet" frame when closing capture file.

The "Go to Packet" frame cannot be used without a capture file so
ensure we hide this when closing a capture file.

Change-Id: I339bc90b87181a8361e9f0bf27dfdf26d2f05333
Reviewed-on: https://code.wireshark.org/review/19783
Petri-Dish: Stig Bjørlykke <stig@bjorlykke.org>
Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org>
Reviewed-by: Anders Broman <a.broman58@gmail.com>

ui/qt/main_window_slots.cpp

@@ -782,6 +782,7 @@ void MainWindow::captureFileClosing() {
     // Reset expert information indicator
     main_ui_->statusBar->captureFileClosing();
     main_ui_->searchFrame->animatedHide();
+    main_ui_->goToFrame->animatedHide();
 //    gtk_widget_show(expert_info_none);
     emit setCaptureFile(NULL);
     emit setDissectedCaptureFile(NULL);