Fix inverted caching logic

[johngodley]

Somehow got inverted during the lint changes

[Copilot]

Pull request overview

This PR fixes inverted caching logic in the WordPress redirect module that was inadvertently introduced during lint changes. The function cache_unmatched_redirects() had two logic errors: it was returning early when there was NO match (opposite of intended behavior), and it was caching the matched value instead of explicitly caching false for unmatched redirects.

Changes:

• Corrected the conditional check to return early when a redirect IS matched (changed === to !==)
• Fixed the cached value to explicitly store false instead of using $this->matched

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