Fix a typo >_>

scripts/remove

@@ -48,7 +48,7 @@ if ynh_exec_warn_less yunohost service status $service_name >/dev/null
 then
     yunohost service stop $service_name
     yunohost service disable $service_name --quiet
-    yunohost service remove $service_checker
+    yunohost service remove $service_name
 fi
 
 for FILE in $(ls /etc/systemd/system/$service_name* /usr/local/bin/ynh-vpnclient* /tmp/.ynh-vpnclient-*)