refactor(dock): parent_dock_area changed to orig_area (native for pyqtgraph)
Description
I realised that I duplicated one functionality from pyqtgraph which they had already implemented. The reference to the parent area after detaching is called orig_area
in pyqtgraph. I changed mine introduced parent_dock_area
to orig_area
except for the configs to get the gui_id BECDockArea