[TASK] Move felogin pi_flexform into plugin tab

The plugin configuration of felogin is moved to the
common used "Plugin" tab, to unify the position
through the core.

Resolves: #91416
Releases: master, 10.4
Change-Id: Ibbf26be6787795021e7ba6a0d3138bbf18121087
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64638
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>

typo3/sysext/felogin/Configuration/TCA/Overrides/tt_content.php

@@ -42,6 +42,7 @@
         --div--;LLL:EXT:core/Resources/Private/Language/Form/locallang_tabs.xlf:general,
             --palette--;;general,
             --palette--;;headers,
+        --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.plugin,
             pi_flexform,
         --div--;LLL:EXT:frontend/Resources/Private/Language/locallang_ttc.xlf:tabs.appearance,
             --palette--;;frames,