Sergey Biryukov c4182fd00f Site Health: Make sure the submit_button() function is available in request_filesystem_credentials().
This avoids a fatal error when the function is called via REST API from `WP_Site_Health_Auto_Updates::test_check_wp_filesystem_method()`.

Props lakrisgubben, mukesh27, Clorith, SergeyBiryukov.
Fixes #53206.
Built from https://develop.svn.wordpress.org/trunk@50979


git-svn-id: http://core.svn.wordpress.org/trunk@50588 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2021-05-24 19:24:57 +00:00
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