fix: [Filters] normalize $filters arguments

[kenjis]

Description
This PR normalizes $filters arguments.
Because Route filter's arguments are already normalized (trimmed).

CodeIgniter4/system/Filters/Filters.php

Line 489 in ab64aeb

[$name, $arguments] = $this->getCleanName($name);

CodeIgniter4/system/Filters/Filters.php

Lines 517 to 531 in ab64aeb

	private function getCleanName(string $name): array
	{
	$arguments = [];
	if (str_contains($name, ':')) {
	[$name, $arguments] = explode(':', $name);
	$arguments = explode(',', $arguments);
	array_walk($arguments, static function (&$item) {
	$item = trim($item);
	});
	}
	return [$name, $arguments];
	}

• normalize $filters arguments
• refactor

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