Fix even setter check

bot/src/plugin_manager.ts

@@ -76,7 +76,7 @@ export class PluginManager {
 
     async start(client: Client): Promise<void> {
         for (const evtName of Object.keys(this.botEvents)) {
-            if (Object.prototype.hasOwnProperty.call(this.botEvents, evtName) || isCustomEvent(evtName))
+            if (!Object.prototype.hasOwnProperty.call(this.botEvents, evtName) || isCustomEvent(evtName))
                 continue;
             client.on(evtName as keyof ClientEvents, async (...args: unknown[]) =>
                 await this.trigger(evtName as EventType, ...args)