[computer use] replace spaces in api_key when starting loop

[bmacer]

this addresses #85.

it would seem that if multiple users have already encountered this, maybe the propensity to copy-paste with a trailing space is common enough to address.

maybe not the most graceful solution, just replaces all spaces when the sampling_loop begins.

prior to the fix, here's the error when i use an API key with a trailing space:

after the fix, no problem, even with a trailing space: