Fix T100163: Eevee: Regression: Displacement maps affected by rotation

This was an oversight as the matrix multiplication present in original
code was reversed.

Reviewed By: jbakker

Differential Revision: https://developer.blender.org/D15858

source/blender/gpu/shaders/material/gpu_shader_material_displacement.glsl

@@ -1,6 +1,6 @@
 void node_displacement_object(float height, float midlevel, float scale, vec3 N, out vec3 result)
 {
-  N = transform_direction(ModelMatrix, N);
+  N = transform_direction(ModelMatrixInverse, N);
   result = (height - midlevel) * scale * normalize(N);
   /* Apply object scale and orientation. */
   result = transform_direction(ModelMatrix, result);