acme: Change boot init script logic to invoke start

The new procd config dependency tracking requires the start method to be
called even on boot. So add a state file that is checked by the run script
to condition the special-case boot run instead of the previous independent
call to the run script.

Ref: https://github.com/openwrt/luci/pull/1769

Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>

net/acme/files/acme.init

@@ -25,7 +25,8 @@ stop_service() {
 }
 
 boot() {
-    $SCRIPT check_cron
+    touch "/var/run/acme_boot"
+    start
 }
 
 service_triggers()