Fixes nonce & permissions check on admin page

[remyperona]

This PR updates the Adminimize settings page handling to tighten nonce validation and capability checks for admin page POST actions, with an additional PHPCS ruleset metadata change.

Changes:

• Moves nonce checks into the POST action conditions before dispatching settings, import, uninstall, and theme actions.
• Replaces several array_key_exists()/truthy POST checks with isset() checks.
• Updates phpcs.xml ruleset metadata and removes one whitespace sniff configuration.

[Copilot]

Pull request overview

This PR updates the Adminimize settings page handling to tighten nonce validation and capability checks for admin page POST actions, with an additional PHPCS ruleset metadata change.

Changes:

• Moves nonce checks into the POST action conditions before dispatching settings, import, uninstall, and theme actions.
• Replaces several array_key_exists()/truthy POST checks with isset() checks.
• Updates phpcs.xml ruleset metadata and removes one whitespace sniff configuration.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
adminimize_page.php	Adjusts nonce and permission handling for settings page actions.
phpcs.xml	Changes PHPCS ruleset metadata and removes a whitespace rule block.

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