Fix missing config usage for backup codes

src/util/entities/BackupCodes.ts

@@ -20,6 +20,7 @@ import { Column, Entity, JoinColumn, ManyToOne } from "typeorm";
 import { BaseClass } from "./BaseClass";
 import { User } from "./User";
 import crypto from "crypto";
+import { Config } from "../util";
 
 @Entity({
 	name: "backup_codes",
@@ -41,7 +42,7 @@ export class BackupCode extends BaseClass {
 
 export function generateMfaBackupCodes(user_id: string) {
 	const backup_codes: BackupCode[] = [];
-	for (let i = 0; i < 10; i++) {
+	for (let i = 0; i < Config.get().security.mfaBackupCodeCount; i++) {
 		const code = BackupCode.create({
 			user: { id: user_id },
 			code: crypto.randomBytes(4).toString("hex"), // 8 characters