plugins/qtermwidget: Use Qt::ImCursorRectangle instead of deprecated …

…Qt::ImMicroFocus

Qt::ImMicroFocus has been deprecated in QT 5.14 and has been removed from
Qt6. Use its replacement, Qt::ImCursorRectangle instead.

src/plugins/grass/qtermwidget/TerminalDisplay.cpp

@@ -2707,7 +2707,7 @@ QVariant TerminalDisplay::inputMethodQuery( Qt::InputMethodQuery query ) const
   const QPoint cursorPos = _screenWindow ? _screenWindow->cursorPosition() : QPoint( 0, 0 );
   switch ( query )
   {
-    case Qt::ImMicroFocus:
+    case Qt::ImCursorRectangle:
       return imageToWidget( QRect( cursorPos.x(), cursorPos.y(), 1, 1 ) );
       break;
     case Qt::ImFont: