Floxis: set gvl_id to 1609

[floxis-admin]

One-line correction: this page reads gvl_id: none, but the Floxis adapter has declared gvlid: 1609 since it merged (modules/floxisBidAdapter.js on master, lines 7 and 171), and IAB GVL vendor 1609 is registered to Ad Tech Company OÜ (GVL v171).

Raising it separately because publishers evaluating the adapter read this page as "no registered TCF vendor ID", which is a blocker for them.

The same line is corrected in #6596, but that PR also flips pbs: true and is held under Pending PBS Release while prebid/prebid-server#4811 is in review — so the fix is currently gated on something unrelated to it. This PR carries only the gvl_id line so it can land independently; I'll rebase #6596 on top once it merges.

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[floxis-admin]

Context on why I split this out instead of waiting for #6596

I know everyone is stretched and our adapter PRs sit here for months without anything happening, could you please merge at least this one. This one line is costing us real business: we're onboarding publishers now and several have stopped dead at gvl_id: none — a TCF publisher reads that as an unregistered vendor and the conversation ends.

I will rebase the other PRs.

Please merge this at least...

[floxis-admin]

markdownlint is green now — 9539c4b1. The errors were in markup that predates this PR (h3 sections with no h2 above them, and an unpadded table row), so I just fixed them here.

This one is only the gvl_id line. The other two Floxis docs PRs are waiting on the server adapters, so no need to look at those yet. Would you mind a look at this one when you get a chance?