[BUGFIX] Use correct call to init pages cache

[spoonerWeb]

Resolves: #488

Summary

This PR can be summarized in the following changelog entry:

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Relevant technical choices:

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Test instructions

This PR can be tested by following these steps:

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Quality assurance

• [ ] I have tested this code to the best of my abilities
• [ ] I have added unittests to verify the code works as intended

Fixes #

[RinyVT]

Thanks for the PR! "Unfortunately" we also still support CMS9, which does not have the new caches naming. Maybe add a check for the version like we do in the ext_tables.php? https://github.com/Yoast/Yoast-SEO-for-TYPO3/blob/master/ext_tables.php#L22-L23