C-g should also get one out of the form select

[jidanni@xxxxxxxxxxx]

C-g should also break out of the form select box, like q in

w3m form select mode:
   Major mode for w3m form select.
RET	Save and exit from w3m form select mode.
q	Exit from w3m form select mode.
<mouse-2>	Save and exit from w3m form select mode with mouse.