refactor: export default 방식 변경

전) export default class {}
후) class {}  export defatul class

후자로 해야 jest test할때 제대로 인식

Resolve: #38

Author: dohun31

server/errors/authorization-error.ts

@@ -1,8 +1,10 @@
 import CustomError from '.';
 import { UNAUTHORIZED } from '@constants/http-status';
 
-export default class AuthorizationError extends CustomError {
+class AuthorizationError extends CustomError {
   constructor(message = 'Unauthorized') {
     super(message, UNAUTHORIZED);
   }
 }
+
+export default AuthorizationError;

server/errors/index.ts

@@ -1,6 +1,6 @@
 import { INTERNAL_SERVER_ERROR } from '@constants/http-status';
 
-export default class CustomError extends Error {
+class CustomError extends Error {
   message!: string;
   status!: number;
 
@@ -14,3 +14,5 @@ export default class CustomError extends Error {
     this.status = status;
   }
 }
+
+export default CustomError;