fix: the error view is determined by Exception code

[kenjis]

Description
It should be determined by the HTTP status code.
Otherwise, if by chance an exception with code 404 is thrown, a 404 Not Found page will be displayed.

<?php

namespace App\Controllers;

use Exception;

class Home extends BaseController
{
    public function index(): string
    {
        throw new Exception('This is an exception message', 404);
    }
}

Before:
404 - Page Not Found

404
This is an exception message

HTTP Status: 500

After:
Exception

Exception #404
This is an exception message 

HTTP Status: 500

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide