xendriverdomain: remove placeholder for sbinpath

vm-systemd/xendriverdomain.service

@@ -4,7 +4,7 @@ ConditionVirtualization=xen
 
 [Service]
 Type=forking
-ExecStart=@sbindir@/xl devd
+ExecStart=/usr/sbin/xl devd
 
 [Install]
-WantedBy=multi-user.target
+WantedBy=multi-user.target