Update Edge user agent detection for legacy version and modern version detection fix

[livenobin]

Update Edge user agent detection for legacy version and modern version that detect Edge with keyword 'Edg'

[CraftedRO]

I don't think this is quite correct, see:
https://github.com/codeigniter4/CodeIgniter4/blob/5f0e0932b73136105424a1fe4599f9b23acce424/app/Config/UserAgents.php#L84-L85

[NielBuys]

Two notes on this:

Order matters here. The Edg pattern will also match a legacy Edge/18… UA (the .*? in the matcher lets Edg + e/18… match), so if Edg comes first, legacy Edge gets caught by it and never reaches the legacy entry. The legacy Edge key needs to come before Edg:

'Edge' => 'Edge Legacy (Spartan)',
'Edg' => 'Edge',
Modern Edge UAs only contain Edg/ (no Edge), so they won't false-match the legacy entry.

The label itself doesn't matter — it's display-only, the key is what's regex-matched against the UA. On my fork I labelled the legacy one 'Edge Legacy (Spartan)' to match CI4's naming and make it obvious it's the old EdgeHTML browser rather than a detection bug, while keeping the modern one as just 'Edge'. Feel free to name them however, but the ordering above is the important part.