[BUGFIX] Enable localizationStateSelector for selectTreeElement

Follow up of the backport for TYPO3 8.7, where some lines of code
have not been merged.

Enables the localizationStateSelector for the selectTreeElement.

Resolves: #84564
Releases: 8.7
Change-Id: Ie39c52652b5175318694775a9dfa5fbbf33f490c
Reviewed-on: https://review.typo3.org/57826
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Tested-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Reviewed-by: Tim Schreiner <schreiner.tim@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

typo3/sysext/backend/Classes/Form/Element/SelectTreeElement.php

@@ -21,6 +21,15 @@
  */
 class SelectTreeElement extends AbstractFormElement
 {
+    /**
+     * @var array Default wizards
+     */
+    protected $defaultFieldWizard = [
+        'localizationStateSelector' => [
+            'renderType' => 'localizationStateSelector',
+        ],
+    ];
+
     /**
      * Default number of tree nodes to show (determines tree height)
      * when no ['config']['size'] is set