pressing shift while running `slurp -o` produces weird results

[norude]

If you press shift, while running slurp -o, the selection from normal slurp invocations pops up and tries to be a square. This shouldn't happen and pressing shift shouldn't do anything

https://github.com/user-attachments/assets/16b17790-4cea-4c1c-ae44-569429f4ed54

[tmccombs]

One nuance here is that slurp -o doesn't prevent you from doing a normal selection. So we need to make sure that with slurp -o using shift when doing a normal selection still works after fixing this.

[iciclejj]

Already fixed by https://github.com/emersion/slurp/pull/132