fix: add missing injector (#63)

Signed-off-by: Mirko Mollik <[email protected]>

apps/holder-backend/src/app/auth/auth.service.ts

@@ -1,11 +1,12 @@
+import { Injectable } from '@nestjs/common';
 import { EventEmitter2 } from '@nestjs/event-emitter';
 
 export const USER_DELETED_EVENT = 'user.deleted';
 
 export class UserDeletedEvent {
   id: string;
 }
-
+@Injectable()
 export class AuthService {
   constructor(private eventEmitter: EventEmitter2) {}