[BUGFIX] Use correct fallback for sort field in FileBrowser

Resolves: #101304
Related: #100949
Releases: main, 12.4
Change-Id: I5ca63b7cdc8fb039392d29490f3e64facb0ba4c1
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/79936


Tested-by: Benjamin Franzke <ben@bnf.dev>
Reviewed-by: Benjamin Franzke <ben@bnf.dev>
Tested-by: core-ci <typo3@b13.com>

typo3/sysext/filelist/Classes/ElementBrowser/FileBrowser.php

@@ -122,7 +122,7 @@ class FileBrowser extends AbstractResourceBrowser
             $this->filelist->start(
                 $this->selectedFolder,
                 MathUtility::forceIntegerInRange($this->currentPage, 1, 100000),
-                $this->getRequest()->getQueryParams()['sort'] ?? 'asc',
+                $this->getRequest()->getQueryParams()['sort'] ?? '',
                 ($this->getRequest()->getQueryParams()['reverse'] ?? '') === '1',
                 Mode::BROWSE
             );