Fix: EEVEE-Next: Wrong thickness for Hybrid material

The thickness was evaluated after the surface nodetree.
So the effective thickness for shader to RGB BSDFs was
undefined.

Fix #120791

source/blender/draw/engines/eevee_next/shaders/eevee_surf_hybrid_frag.glsl

@@ -44,14 +44,14 @@ void main()
   float noise = utility_tx_fetch(utility_tx, gl_FragCoord.xy, UTIL_BLUE_NOISE_LAYER).r;
   float closure_rand = fract(noise + sampling_rng_1D_get(SAMPLING_CLOSURE));
 
+  g_thickness = nodetree_thickness() * thickness_mode;
+
   fragment_displacement();
 
   nodetree_surface(closure_rand);
 
   g_holdout = saturate(g_holdout);
 
-  g_thickness = nodetree_thickness() * thickness_mode;
-
   /** Transparency weight is already applied through dithering, remove it from other closures. */
   float transparency = 1.0 - average(g_transmittance);
   float transparency_rcp = safe_rcp(transparency);