Fix e2e tests timeout (#53)

test/bootstrap.ts

@@ -22,7 +22,6 @@ export class Bootstrap {
    * Initialize the application.
    */
   public async init(): Promise<INestApplication> {
-    jest.setTimeout(30000);
     this.module = await Test.createTestingModule({
       imports: [
         AppModule,

test/category-crud.e2e-spec.ts

@@ -3,6 +3,8 @@ import { Bootstrap } from './bootstrap';
 import { CreateCategory } from '../src/category/category.dto';
 
 describe('category creation', () => {
+  jest.setTimeout(30000);
+
   let bootstrap: Bootstrap;
   let authCookie: string;