stick to one error response class

src/main/java/com/faf223/expensetrackerfaf/controller/auth/ErrorResponse.java

@@ -1,16 +0,0 @@
-package com.faf223.expensetrackerfaf.controller.auth;
-
-import lombok.Getter;
-import lombok.Setter;
-
-@Getter
-@Setter
-public class ErrorResponse {
-    private String error;
-    private String message;
-
-    public ErrorResponse(String error, String message) {
-        this.error = error;
-        this.message = message;
-    }
-}