GUI: Exiting Manager Mode should close protected OPIs

As an instrument scientist, I would like to be confident that when I exit "Manager Mode" in the IBEX client, the protected OPIs I had open are closed.

This was noticed during testing of the new `mymotor.opi` when the detailed motor OPI was opened, but may be present in other situations (e.g. jaws manager OPIs).

To reproduce (for motors):

1. Enter Manager Mode.
2. Open the `mymotors.opi`, for example from the Motors perspective.
3. Click on the `More details...` button to open the detailed panel.
4. Exit Manager Mode.
5. The detailed motor OPI remains open and operable.