Quick/Bulk Edit: Revert [48134] to address the bottom "Bulk actions" dropdown...

Quick/Bulk Edit: Revert [48134] to address the bottom "Bulk actions" dropdown not functioning properly on Posts and Users list tables.

A better solution for the original issue will be explored in a future release.

Props audrasjb, garrett-eclipse, webzunft, Krstarica, chunkysteveo, SergeyBiryukov.
Merges [48866] to the 5.5 branch.
Fixes #50882, #50998. See #46872.
Built from https://develop.svn.wordpress.org/branches/5.5@48867


git-svn-id: https://core.svn.wordpress.org/branches/5.5@48629 1a063a9b-81f0-0310-95a4-ce76da25c4cd