clean up and lint files

src/app/services/db.service.ts

@@ -11,8 +11,7 @@ type DocumentPredicate<T> = string | AngularFirestoreDocument<T>;
   providedIn: 'root',
 })
 export class DbService {
-  public constructor(private afs: AngularFirestore) {
-  }
+  public constructor(private afs: AngularFirestore) {}
 
   public col<T>(ref: CollectionPredicate<T>, queryFn?: QueryFn): AngularFirestoreCollection<T> {
     return typeof ref === 'string' ? this.afs.collection<T>(ref, queryFn) : ref;