* Update ExecReload command in x-ui.service.debian
* fix(systemd): use absolute path in ExecReload for arch and rhel units
systemd requires absolute executable paths; kill -USR1 $MAINPID fails
with 'Executable path is not absolute'. Matches the debian unit fix.
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Co-authored-by: MHSanaei <ho3ein.sanaei@gmail.com>
