Correct option name 

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/branches/EmailImprovement@911717 b8457f37-d9ea-0310-8a92-e5e31aec5664
Content type HTML to wp emails

git-svn-id: https://plugins.svn.wordpress.org/redi-restaurant-reservation/branches/EmailImprovement@911718 b8457f37-d9ea-0310-8a92-e5e31aec5664