Admin: remove duplicated save/new page buttons on the BP Settings > Pages screen.

Removing these buttons simplifies the UI for this screen. We can revisit the "Add Page" button in particular in the future.

Fixes #6044

git-svn-id: https://buddypress.svn.wordpress.org/trunk@9193 cdf35c40-ae34-48e0-9cc9-0c9da1808c22