remove Response Action glos entry

The entry ('\gls{quickaction}') is not present in all books, and there's
no natural way to include it.  However, it holds the rule that:

- In combat, you can have Negative AP, and
- negative AP becomes a Penalty.

It's a central feature of the combat, so it should be included.  But the
glossary reference fits nowhere naturally, and it's really just a
different phrasing of a Resisted Action (already covered elsewhere).

With the glossary entry removed, the rules now goes in \gls{round} (but
it might fit better elsewhere?).