Selecting a module through a keyboard shortcut collapses it
Steps to reproduce:
1. Set keyboard shortcuts for 2 modules in two different groups (tabs)
2. Select module 1. It expands
3. Select module 2. Tab is changed and module 2 expands
4. Select module 1 again. Tab is changed but as module 1 was already expanded within its tab, it is collapsed.
NB: this was tested with option "darkroom/ui/single_module" enabled.
In the proposed patch, I removed the "all_other_closed" variable from method imageop.c::dt_iop_gui_set_expanded, which I think is not needed anymore, but as my knowledge of the darktable code is limited it would be good to review this more closely.