Login program - if selected, auto-install on first start

[licaon-kter]

...so either do this or fix #6

[imkiva]

Good idea~

[imkiva]

Available in v1.2.6!

[licaon-kter]

There is now another issue here with the selection not sticking at first.

Steps:

• Install/clean app data
• Start
• Settings - general - login settings
• Select zsh
• See prompt - select install
• Enter Login settings - see zsh as selected
• Close all terminals
• Open a new one - see IT'S NOT zsh
• Settings - general - login settings
• See sh as selected and NOT zsh
• Select zsh again
• Close all terminals
• Open a new one - now it's ok, it's zsh