utils/edid: Report monitor name without serial number
This fixes the use of a redundant serial number in both the KScreen KCM and the outputlocator effect. Logic already exists in both to insert the serial number when the manufacturer and model numbers are insufficient to disambiguate.
BUG: 500471
This became relevant in KScreen with kscreen!326 (merged). We previously used the edid model specifically. I am not sure why we report the serial number here, so there might be side effects not expected by me — but a quick test appears fine and resolves the issue in both locations.
I recommend picking to 6.3.