Few changes relative to frame dim in the simulator Tango device
This MR make sure the frame dim is property setup at start from the Tango property.
- The detector info was not up-to-date with the requested frame size
- Changing the simulation mode is not anymore resetting the frame size
This already fixes the issue.
But i have also reorder the tango simulator initialization to set the mode first, then the frame size. This could be removed from the PR.