Override pinentry program in a terminal

[Ondřej Synáček]

I use pass mostly with browser using FFPass. For this to work, I had to 
install `pintentry-mac` so the dialog box would appear to decrypt the 
password. However sometimes it’d be more useful to just use terminal 
instead when I’m working on command line.
Is there some kind of environment variable that could be use for this? I 
tried doing something like `DISPLAY=“” pass -c mypassword` but with 
no luck (I’m on macOS).