audiohook: Use manipulated frame instead of dropping it.

Previous changes to sample rate support in audiohooks accidentally
removed code responsible for allowing the manipulate audiohooks
to work. Without this code the manipulated frame would be dropped
and not used. This change restores it.

ASTERISK-25253 #close

Change-Id: I3ff50664cd82faac8941f976fcdcb3918a50fe13