Bugfix: change webjump type slightly

complete on just the cars of webjump-sites
Bugfix: check for valid items in one-key-regs-update-menu-alist

Altered items:
one-key-regs-update-menu-alist
Bugfix: ensure one-key-buffer-temp-action is nil when command finished

one-key-buffer-temp-action is buffer local so needs to be set in the context
of the *One-Key* buffer.

Altered items:
one-key-command