deskutils/xfce4-notifyd: Correctly depend on canberra for sound support

Upstream configure script does not have a specific canberra knob,
so use the sound knob to really control linking to canberra library
for sound support.

To better describe the option I renamed it to SOUND (still disabled
by default)

PR: 273805
Fixes: 4018c2022be41e2e634d970655cfe78c4b997dc0
MFH: 2023Q3

(cherry picked from commit 68465db0de72a4756c696e8cab1a380eb9697f31)