Restore smartparens state on exit

[next-mad-hatter]

Currently I'm using parinfer-mode alongside evil-lisp-state in my spacemacs setup. The former isn't compatible with smartparens, while the latter depends on it.

As far as I can see, this setup works when smartparens is deactivated in insert/hybrid mode, where parinfer is active. But evil-lisp-state forces activation of smartparens, and then leaves it active.

This is an attempt to restore previous smartparens state when exiting lisp-state.