Fix for Gentle Touch skills

Regarding this bug report
http://rathena.org/board/tracker/issue-8758-gentle-touch-spheres/?gopid=25662#entry25662

Confirmed based on iRO
http://irowiki.org/wiki/Gentle_Touch-Cure
http://irowiki.org/wiki/Gentle_Touch-Convert
http://irowiki.org/wiki/Gentle_Touch-Revitalize