SNMP Traps: run alert rules only when necessary (librenms#18416)

* Refactor alertrule condition in Dispatcher.php

* StyleCI

* Simplified logic

* Nvm. Original logic was correct.

* NVM to my NVM. lol.

Author: electrocret

LibreNMS/Snmptrap/Dispatcher.php

@@ -65,7 +65,8 @@ public static function handle(Trap $trap): bool
         $detailed = LibrenmsConfig::get('snmptraps.eventlog_detailed', false);
         if ($logging == 'all' || ($fallback && $logging == 'unhandled')) {
             $trap->log($trap->toString($detailed));
-        } else {
+        }
+        if ($logging != 'none' || ! $fallback) {
             $rules = new AlertRules;
             $rules->runRules($trap->getDevice()->device_id);
         }