0010_kwallet: detach kwalletd6 from autostart service cgroup

Same root cause as the gocryptfs and Nextcloud fixes: kwalletd6 is a
long-running daemon that stays alive for the entire KDE session.
Launching it with setsid keeps it in the autostart service cgroup,
preventing app-logon_script.sh@autostart from reaching finished state.

Replace setsid with systemd-run --user --scope so kwalletd6 runs in
its own transient scope cgroup.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client_software/0010_kwallet/user_run.sh

@@ -11,7 +11,7 @@ if [[ -z $(wmctrl -m | grep "KWin") ]]; then
 fi
 
 #Restart the service
-/usr/bin/setsid kwalletd6 >${TEMPDIR}/kwalletd6.log 2>&1 &
+systemd-run --user --scope --unit=kwalletd6-logon kwalletd6 >${TEMPDIR}/kwalletd6.log 2>&1 &
 sleep 1
 
 #Check if kwalletd is enabled now