MH-9135 corrected presenter/presentation buttons in trim UI

git-svn-id: http://opencast.jira.com/svn/MH/branches/1.4.x@13552 e6edf6fb-f266-4316-afb4-e53d95876a76
Undo last commit - wrong branch

git-svn-id: http://opencast.jira.com/svn/MH/branches/1.4.x@13553 e6edf6fb-f266-4316-afb4-e53d95876a76