Get rid of spurious gear icon in BT details page

The problem is that we were calling done() on the EntityHeaderController
and passing false for whether to rebind the action buttons, which means
we were getting the default behavior including a visible gear
icon. Passing true to request rebinding causes that icon to be hidden.

Bug: 63405635
Test: make RunSettingsRoboTests
Change-Id: I031f4a2d176ff3be025cc2675d7026a679936b03