Set PVI detail bob screen titles to name of the device

[niamhdougan]

At the moment there's duplication of what the detail screen is for but not the associated device name, which could get confusing if you have multiple tabs open in Phoebus.

It would be better to have the title as e.g. BL01C-MO-PPMAC-01, then the group box underneath lets you know it contains Pmac Controller widgets.

[GDYendell]

Agreed, this would be nicer. The title on the screen and the tab are both from the top-level label on the device, e.g. https://github.com/epics-containers/ibek-support/blob/main/pmac/ppmacController.pvi.device.yaml#L1

It can be whatever you want, including $(MACROS), which phoebus will render if it has the values.