app: deny keychain permissions results in crash

[rabsef-bicrym]

Denying keychain permissions after setting your password results in an error screen you cant get past. Closing and reopening successfully connects to your urbit but skips first time install realm functionality.

[drunkplato]

We added this in our internal bug list and will look into it.

[ajlamarc]

Shouldn't happen anymore with new onboarding