ah detach: don't print held time if actually detached
ah detach: don't print held time if actually detached

Confusingly an ah held time was printed for a previously detached ah.

Clear down the time field when detaching the ah so this can't happen any more.
sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets,sartura/libwebsockets