fix snap time regex replacement

src/webui/explore.php

@@ -116,7 +116,7 @@ if ($config->snap->storage->local->enabled)
 
       $time = preg_replace(
         '/^([\d]+)\.tar\.gz&/',
-        '',
+        '$1',
         $basename
       );
 
@@ -170,7 +170,7 @@ foreach ($config->snap->storage->remote->ftp as $i => $ftp)
 
       $time = preg_replace(
         '/^([\d]+)\.tar\.gz&/',
-        '',
+        '$1',
         $basename
       );