[Controller] Please add shortcut for instilling window's show inventory/stash

The instilling window was updated, it now allows you to swap between stash and main inventory from the instilling window. This was a VERY GOOD change! Now we can instill from inside the delirium tab.

But, in order to instill waystones that are in my inventory, we need to keep swapping between show main inventory and show stash, and there is no shortcut for that swap. So, when playing with controller, this is very clunky.

I would suggest that a shortcut needs to be added to swap between main inventory and stash. I think that the RT (R2) could be this shortcut. This input is only used now as the 'bypass affinity' button, and since we can't use bypass affinity while in the instilling window, this button is fully avaiable! So in my opinion we could use RT/R2 to swap between "show main inventory" and "show stash" while playing on controller. This would make instilling items a lot better.