Fix bug where it was impossible to exit Overwrite mode.

mainwindow.cpp

@@ -406,10 +406,14 @@ void MainWindow::overwriteToggled(bool state)
                                       QMessageBox::Yes|QMessageBox::No);
         if (confirmDialog == QMessageBox::Yes)
         {
-            model->setOverwriteMode(state);
+            model->setOverwriteMode(true);
         }
         else ui->cbOverwrite->setCheckState(Qt::Unchecked);
     }
+    else
+    {
+        model->setOverwriteMode(false);
+    }
 }
 
 void MainWindow::updateFilterList()