Fix translation extraction

Adapt Messages.sh to extract strings from QML files

BUG: 429466

kcms/autostart/Messages.sh

-#! /usr/bin/env bash
-$EXTRACTRC *.ui >> rc.cpp
-$XGETTEXT *.cpp -o $podir/kcm_autostart.pot
-rm -f rc.cpp
+#!/usr/bin/env bash
+
+$XGETTEXT `find . -name '*.cpp' -o -name '*.qml'` -o $podir/kcm_autostart.pot