Fixed UDP Realtime streaming in DNRGBW Mode

[Christanoid]

The udp.cpp class contained code to handle dnrgbw as a possible format, however a earlier if filtered out the possibility of actually using that mode due to not accepting the first protocol selection byte being 5 (4 is dnrgb, 5 was already added to be dnrgbw, however then filtered out again)

[Christanoid]

Note: If this PR goes through smoothly I'll adapt the documentation next to ensure it is also documented on https://kno.wled.ge/interfaces/udp-realtime

[softhack007]

@Christanoid thanks for your contribution.

As a general matter (applies to all PRs), please don't force-push while you have a PR open for our repo. We regularly lose review comments and have other weird behaviour due to force-pushers. You can simply add (push) commit to your branch, they will be added to the PR and visible to us. Thanks.

Christanoid force-pushed the main branch from b722f7a to 8ee2c44  16 hours ago

[Christanoid]

I have read the rule on force pushing, sorry for going agianst it, I decided that since the PR was only a few minutes old and it was 1 AM (did not think about timezones, that one's on me), nobody will have seen it yet. Reason for the force push was a bit of local git chaos on my end forcing me to pull from the repo again before committing since my local checked out WLED folder was a bit older, so this PR's history was multiple commits, one of which was unnecessary. I therefore thought I might aswell clean the commit history. Won't do again in the future, once the PR is accepted it will likely get squashed anyways I assume.