AppConfigMock: Use correct loglevel

Until now the app config mock used ts-loader's LogLevel instead of our own Loglevel, which is obviously wrong.

Signed-off-by: Philip Molares <philip.molares@udo.edu>

src/config/mock/app.config.mock.ts

@@ -5,13 +5,13 @@
  */
 
 import { registerAs } from '@nestjs/config';
-import { LogLevel } from 'ts-loader/dist/logger';
+import { Loglevel } from '../loglevel.enum';
 
 export default registerAs('appConfig', () => ({
   domain: 'md.example.com',
   rendererOrigin: 'md-renderer.example.com',
   port: 3000,
-  loglevel: LogLevel.ERROR,
+  loglevel: Loglevel.ERROR,
   maxDocumentLength: 100000,
   forbiddenNoteIds: ['forbiddenNoteId'],
 }));