fix: remove MAGIC_LINK_SECRET env variable check

Llikely committed incorrectly while working in another branch.

Author: Bentroen

server/src/auth/auth.module.ts

@@ -62,12 +62,6 @@ export class AuthModule {
           useFactory: (configService: ConfigService) =>
             configService.getOrThrow<string>('SERVER_URL'),
         },
-        {
-          inject: [ConfigService],
-          provide: 'MAGIC_LINK_SECRET',
-          useFactory: (configService: ConfigService) =>
-            configService.getOrThrow<string>('MAGIC_LINK_SECRET'),
-        },
         {
           inject: [ConfigService],
           provide: 'FRONTEND_URL',