SAK-23447 - Hitting the enter key to enter grades on a gradebook item fails due to javascript error

- edited the saveButton references to saveButton1 to bind with the id of the first submit button on the page



git-svn-id: https://source.sakaiproject.org/svn/gradebook/trunk@124118 66ffb92e-73f9-0310-93c1-f5514f145a0a