feat(ugc): glitter flecks still by default

Glitter plastic has its flecks set in it; they catch the light as the view
moves, which LEGO-AnimUV can't do (it can only slide the texture). Drifting
flecks read as something flowing over the brick, so glitter_speed defaults
to 0: still flecks and no controllers. 1 and up still drift.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

resources/ugcconfig.ini

@@ -94,7 +94,8 @@ brushed_colors=298,300,1002,1004
 #   transparent ones, S<id>_GlitterAlpha_Model: 21 is LEGO-AnimUV, which lays a white fleck texture stored in the .nif
 #   over the color and moves it. 0: off, glitter stays plastic.
 # glitter_size: the fleck texture's tile in model units (a stud is 0.8); glitter_density: flecks in a tile;
-# glitter_speed: 1 moves the flecks a tile in 7 s one way and 11 s the other, 0 keeps them still.
+# glitter_speed: 0 (the default) keeps the flecks still, like those set in glitter plastic; 1 moves them a tile in
+#   7 s one way and 11 s the other.
 # glitter_colors: LEGO color ids that are glitter whatever their type (empty: the default, 114,117, which LEGO's color
 #   data calls glitter; none: no colors)
 shader_glitter=21
@@ -102,7 +103,7 @@ glitter_material_types=glitter
 glitter_colors=114,117
 glitter_size=1.6
 glitter_density=50
-glitter_speed=1
+glitter_speed=0
 # Satin (opal) colors stay transparent plastic (the client has no satin shader) but are made milky:
 # satin_colors: color ids (empty: the default, LEGO's satin colors 360,362,363,364,365,366,367,376; none: off),
 # satin_opacity: their transparent bricks' opacity in percent (instead of transparent_opacity),