Cancel reservation send ID as a string

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@1025568 b8457f37-d9ea-0310-8a92-e5e31aec5664
ID is not needed here

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/trunk@1025570 b8457f37-d9ea-0310-8a92-e5e31aec5664