ALSA: seq: Fix yet another spot for system message conversion

We fixed the incorrect UMP type for system messages in the recent
commit, but it missed one place in system_ev_to_ump_midi1().
Fix it now.

Fixes: e9e02819 ("ALSA: seq: Automatic conversion of UMP events")
Fixes: c2bb79613fed ("ALSA: seq: Fix incorrect UMP type for system messages")
Link: https://lore.kernel.org/r/20240530101044.17524-1-tiwai@suse.deSigned-off-by: Takashi Iwai <tiwai@suse.de>

sound/core/seq/seq_ump_convert.c

@@ -729,6 +729,7 @@ static int system_ev_to_ump_midi1(const struct snd_seq_event *event,
 				  union snd_ump_midi1_msg *data,
 				  unsigned char status)
 {
+	data->system.type = UMP_MSG_TYPE_SYSTEM; // override
 	data->system.status = status;
 	return 1;
 }