Dictation module does not email recording due to sox parameter incompatibilies

sox no longer accepts the -w option from v14.1.

This causes the dictation module (*35) to report success to the user, but no email is sent.

Running by hand gives an error message invalid parameter w to sox.

in sox v14.1.0 the correct parameter is -2
in sox v14.2.0 the correct parameter is -b 16

The simple workaround is to modify the file /var/lib/asterisk/bin/audio-email.pl by hand substituing the -w with the correct syntax for the version of sox in use.