[BUGFIX] Skip language -1 in preview url generation

Resolves: #86623
Releases: master
Change-Id: Ic7e6c8dd5b7232f2ee2e3f84664b25835e782677
Reviewed-on: https://review.typo3.org/58612
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Raphael Graf <r@undefined.ch>
Tested-by: Raphael Graf <r@undefined.ch>
Reviewed-by: Alexander Grein <alexander.grein@gmail.com>
Tested-by: Alexander Grein <alexander.grein@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>

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

@@ -1027,7 +1027,10 @@ protected function getPreviewUrlParameters(int $previewPageId): string
                 // use parent record
                 $recordId = $recordArray[$l18nPointer];
             }
-            $linkParameters['L'] = $recordArray[$languageField];
+            $language = $recordArray[$languageField];
+            if ($language > 0) {
+                $linkParameters['L'] = $language;
+            }
         }
 
         // map record data to GET parameters