Fix: EEVEE-Next: Displacement doesn't affect normal map node

While this might not always be the expected behavior,
this at least make it consistent with Cycles.

Fix #122184
Rel #122212

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

@@ -633,7 +633,7 @@ vec3 displacement_bump()
 void fragment_displacement()
 {
 #ifdef MAT_DISPLACEMENT_BUMP
-  g_data.N = displacement_bump();
+  g_data.N = g_data.Ni = displacement_bump();
 #endif
 }