fix: added .ai files to allowed upload mime types

[GrigoreMihai]

Summary

The issue here was that WP is not allowing .Ai files to be uploaded by default.

To fix this I used get_allowed_mime_types() to get the default types allowed by WP then appended '.ai' files to the list before passing it to wp_check_filetype_and_ext() .

The added extensions can also be modified by a filter from now on.

Will affect visual aspect of the product

NO

Screenshots

Test instructions

Try to upload an .ai file. I used this sample to test: https://github.com/newsdev/ai2html/blob/master/sample%20files/sample-ai-file.ai .

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR (if you're not sure who to assign, we can do this step for you)

Closes https://github.com/Codeinwp/ppom-pro/issues/328.

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🎉 This PR is included in version 32.0.23 🎉

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