Buttons in entry toolbar have all four rounded corners.

Previously, because of how bootstrap button toolbars work:

- "Read" button had only right corners rounded.
- "Unread" button had only left corners rounded.

This is because Bootstrap assumes that buttons in a toolbar are one next to another, so that the "touching" corners are not rounded, only the "edge" ones. This is not our case, we are replacing one button with another.