fix: wrong Config classname to config() in Toolbar

[kenjis]

Description
From 6f8f3a2

I don't know why, but this bug crashes spark serve with #7733

Steps to Reproduce

Check out #7733. Run spark serve.

CodeIgniter development server started on http://localhost:8080
Press Control-C to stop.
[Tue Jul 25 14:07:30 2023] PHP 8.1.21 Development Server (http://localhost:8080) started

Navigate to http://localhost:8080/, and I see:

Unable to connect
Firefox can’t establish a connection to the server at localhost:8080.

[Tue Jul 25 14:07:55 2023] [::1]:50620 Accepted
CodeIgniter development server started on http://localhost:8081
Press Control-C to stop.
[Tue Jul 25 14:07:55 2023] PHP 8.1.21 Development Server (http://localhost:8081) started

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

[kenjis]

self::class is CodeIgniter\Debug\Toolbar, and the basename is Toolbar.
So Factories will load Config\Toolbar (preferApp) now.

[kenjis]

But with #7733, Factories will try to instantiate CodeIgniter\Debug\Toolbar,
and it causes:

ArgumentCountError
Too few arguments to function CodeIgniter\Debug\Toolbar::__construct(), 0 passed in 
/.../CodeIgniter4/system/Config/Factories.php on line 183 and exactly 1 expected

But I was not able to get the error message and error log if I did not enable step debugging with Xdebug.
Why spark serve died without log?

[MGatner]

I'm not sure; that's an odd one. Maybe some kind of autoloading loop?