krunner: Always set cursor position to end when focusing search field

BUG: 435604

lookandfeel/contents/runcommand/RunCommand.qml

@@ -259,6 +259,7 @@ ColumnLayout {
                     if (!/[\x00-\x1F\x7F]/.test(event.text)) {
                         queryField.text += event.text;
                     }
+                    queryField.cursorPosition = queryField.text.length
                     queryField.focus = true;
                 }
             }