Fix crash when trying to close database during unlock

* Fix #7239 - prevent closing the database widget if the open dialog is still unlocking the database. This problem became slightly worse with quick unlock.

With this fix, if the user tries to close the database during unlock we will just ignore that request.

src/gui/DatabaseWidget.cpp

@@ -1565,12 +1565,12 @@ Group* DatabaseWidget::currentGroup() const
 
 void DatabaseWidget::closeEvent(QCloseEvent* event)
 {
-    if (!isLocked() && !lock()) {
+    if (!lock() || m_databaseOpenWidget->unlockingDatabase()) {
         event->ignore();
         return;
     }
-    m_databaseOpenWidget->resetQuickUnlock();
 
+    m_databaseOpenWidget->resetQuickUnlock();
     event->accept();
 }