Change LIST VOICES in the internal module protocol.
Change LIST VOICES in the internal module protocol.

Trevor's patch to module_main.c changed the command from LIST VOICES to
LIST_VOICES.  We need to do the same in server/output.c, where the
command is sent.

Signed-off-by: Christopher Brannon <12dbcddb2a34235e759e3c56208f0d4ec028c34a@gmail.com>

razr/opentts,razr/opentts,razr/opentts,razr/opentts