fix remote snaps list builder

src/webui/explore.php

@@ -164,6 +164,11 @@ foreach ($config->snap->storage->remote->ftp as $i => $ftp)
 
     foreach ((array) $remote->nlist($filepath) as $filename)
     {
+      if (is_dir($filename) || is_link($filename) || str_starts_with($filename, '.'))
+      {
+        continue;
+      }
+
       $basename = basename(
         $filename
       );