removed an old debug log message in i.log

git-svn-id: http://piwigo.org/svn/trunk@20578 68402e56-0260-453c-a942-63ccdbb3a9ee

i.php

@@ -303,7 +303,6 @@ function try_switch_source(DerivativeParams $params, $original_mtime)
       return false; // cannot really know if a watermark is required
     $dsize = $params->compute_final_size($original_size);
     $use_watermark = $params->will_watermark($dsize);
-    ilog($use_watermark, $dsize);
   }
 
   $candidates = array();