Added fix to the addSystemVarSettings so that if post_max_size is se…

…t to 0 (unlimited) then max_upload_filesize should be the limiter (#538)

src/Controller/Admin/IndexController.php

@@ -313,7 +313,7 @@ protected function addSystemVarSettings(array &$settings): static
         // upload limit
         $max_upload = filesize2bytes(ini_get('upload_max_filesize') . 'B');
         $max_post = filesize2bytes(ini_get('post_max_size') . 'B');
-        $upload_mb = min($max_upload, $max_post);
+        $upload_mb = min($max_upload, $max_post) ?: $max_upload;
 
         $settings['upload_max_filesize'] = (int) $upload_mb;