ALSA: seq: ump: Fix missing System Reset message handling

The conversion from System Reset event to UMP was missing.
Add the entry for a conversion to a proper UMP System message.

Fixes: e9e02819

 ("ALSA: seq: Automatic conversion of UMP events")
Link: https://lore.kernel.org/r/20240531123718.13420-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>