Add Panasonic DC-TZ91 as an alias to Panasonic DC-TZ90
Add Panasonic DC-TZ91 as an alias to Panasonic DC-TZ90

Refs. https://github.com/darktable-org/darktable/issues/3996

LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,LebedevRI/rawspeed,LebedevRI/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed,darktable-org/rawspeed