scripted-diff: Rename ShowModalDialogAndDeleteOnClose

-BEGIN VERIFY SCRIPT-
sed -i 's/ShowModalDialogAndDeleteOnClose/ShowModalDialogAsynchronously/' -- $(git grep -l -e "ShowModalDialogAndDeleteOnClose")
-END VERIFY SCRIPT-

It is important to highlight that a modal dialog is showed
asynchronously as there are cases when the synchronous QDialog::exec()
is required.

src/qt/guiutil.cpp

@@ -984,7 +984,7 @@ void PrintSlotException(
     PrintExceptionContinue(exception, description.c_str());
 }
 
-void ShowModalDialogAndDeleteOnClose(QDialog* dialog)
+void ShowModalDialogAsynchronously(QDialog* dialog)
 {
     dialog->setAttribute(Qt::WA_DeleteOnClose);
     dialog->setWindowModality(Qt::ApplicationModal);