unpaid sanity_check: leaving shop via recoil

unpaid sanity_check: leaving shop via recoil

Throwing while levitating or getting hit for knockback effect could
move hero carrying unpaid items out of a shop.  If that happened,
sanity_check complained that unpaid items weren't in a tended shop.

Check for entering and leaving special rooms during recoil same as
gets done for ordinary movement.  Leaving a shop via recoil or
knockback while owing a bill now gets treated as robbery immediately
rather than waiting until hero voluntarily moves to another spot
after recoil has finished.