Palette cache: Use correct marshal function
Palette cache: Use correct marshal function

In order to invalidate a single palette cache item, we were using
spice_marshall_msg_cursor_inval_one(), which is the marshal function
used to send an invalidation message for the Cursor channel's cache.
This didn't cause any problems because SPICE_MSG_CURSOR_INVAL_ONE and
SPICE_MSG_DISPLAY_INVAL_PALETTE have the same message ID and parameters,
but it's better to use the correct marshalling function.

Acked-by: Frediano Ziglio <55d48b080b2e443e395cde84d2c83b135a4ff48e@redhat.com>

fgouget/spice,fgouget/spice,fgouget/spice,SPICE/spice,SPICE/spice,SPICE/spice,fgouget/spice