app_voicemail_odbc: remove macrocontext from voicemail_messages table

app_voicemail_odbc: remove macrocontext from voicemail_messages table

When app_macro was deprecated, the macrocontext column was removed from
the INSERT statement but the binds were not renumbered. This broke the
insert.

This change removes the macrocontext column via alembic and re-numbers
the existing columns in the INSERT.

Fixes: #527
UserNote: The fix requires removing the macrocontext column from the
voicemail_messages table in the voicemail database via alembic upgrade.

UpgradeNote: The fix requires that the voicemail database be upgraded via
alembic. Upgrading to the latest voicemail database via alembic will
remove the macrocontext column from the voicemail_messages table.