Use more appropriate icons and tooltips for the room info drawer handles

Right now they use the standard text but left and right arrow icons, which is a bit odd, and I think fails to convey what will happen when clicked especially whern thw drawer is closed.

Instead, let's use descriptive tooltip text for both, and a descriptive icon for the the "this will open the drawer" handle button. For the one to close the drawer, the default icon seems better, so let's stop overriding it.

Drawer closed	Drawer open