[FIRE-34340] Issue 2: Fix camavdist RLVa command to use impostors instead of jelly dolls

[Atasly]

Fixes FIRE-34340 Second Issue, i.e.

Issue 2:
@camavdist:1=n hides avatars or turns them into slightly pixelated tiny blobs

This issue has been opened a second one with FIRE-35778 which had been resolved with commit 86760e7

But I believe the original intent was to have the actual silhouette of an avatar, made pitch black, rendered through an impostor, instead of a jelly doll.

For reference, this is what RLV LSL documentation says:

When active, this restriction makes all the avatars beyond <distance> look as if they were visually muted, but colored pitch black. 

I could not confirm original behaviour as non PBR FS viewer (6.6.17) already had the issue. I did not go further back in git history to track down the actual intended behaviour.
Any Impostors rendering issues are not fixed by this PR.

Furthermore, I would like to denote that the Third Issue from FIRE-34340 has been fixed or is at least not reproductible on my end.

[Ansariel]

Why include too complex avatars as well?

[Atasly]

Per your comment I realized I mistakenly switched two logic blobs while iterating over this issue.
The line you meant is indeed redundant/not needed, but the newly committed one is required for proper RLV silhouettes colorization.

if (visually_muted || too_complex || rlv_silhouette)
{
    gGL.setColorMask(true, true);
}

Apologies for the mishaps.