sidetone: Remove an invalid const specifier.
sidetone: Remove an invalid const specifier.

jusa/pulseaudio-modules-nemo,jusa/pulseaudio-modules-nemo,nemomobile/pulseaudio-module-cmtspeech-n9xx,nemomobile/pulseaudio-module-cmtspeech-n9xx,jusa/pulseaudio-modules-nemo