Add explicit Unit directive to mesh_bot_w3.timer

Co-authored-by: SpudGunMan <12676665+SpudGunMan@users.noreply.github.com>

etc/mesh_bot_w3.timer

@@ -4,6 +4,7 @@ Description=Run mesh_bot_w3.service daily at 4:20 am
 [Timer]
 OnCalendar=*-*-* 04:20:00
 Persistent=true
+Unit=mesh_bot_w3.service
 
 [Install]
 WantedBy=timers.target