[BUGFIX] Don't ignore TCA 'ctrl' 'groupName'

The new records controller (list modul "+" button) tries
to group records. TCA 'ctrl' property 'groupName'
can be used to hint this grouping.

Current code overrides TCA groupName with split magic
based on table name, though. The patch fixes this.

Resolves: #98036
Related: #95366
Releases: main, 11.5
Change-Id: Ief6cff81a8d9523285d95cf423b608f55a8ddab0
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/75813
Tested-by: Falk Gebauer <fgebauer@3pc.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Falk Gebauer <fgebauer@3pc.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/backend/Classes/Controller/NewRecordController.php

@@ -481,7 +481,7 @@ protected function renderNewRecordControls(): void
                     $groupName = $v['ctrl']['groupName'] ?? null;
                     $title = (string)($v['ctrl']['title'] ?? '');
                     if (!isset($iconFile[$groupName]) || $nameParts[0] === 'tx' || $nameParts[0] === 'tt') {
-                        $groupName = $nameParts[1] ?? null;
+                        $groupName = $groupName ?? $nameParts[1] ?? null;
                         // Try to extract extension name
                         if ($groupName) {
                             $_EXTKEY = '';