Fix parallax mapping (#9003)

# Objective

Since 10f5c92, parallax mapping was broken.

When #5703 was merged, the change from `in.uv` to `uv` in the pbr shader
was reverted. So the shader would use the wrong coordinate to sample the
various textures.

## Solution

We revert to using the correct uv.

crates/bevy_pbr/src/render/pbr.wgsl

@@ -55,7 +55,7 @@ fn fragment(
 #endif
 #ifdef VERTEX_UVS
     if ((pbr_bindings::material.flags & pbr_types::STANDARD_MATERIAL_FLAGS_BASE_COLOR_TEXTURE_BIT) != 0u) {
-        output_color = output_color * textureSampleBias(pbr_bindings::base_color_texture, pbr_bindings::base_color_sampler, in.uv, view.mip_bias);
+        output_color = output_color * textureSampleBias(pbr_bindings::base_color_texture, pbr_bindings::base_color_sampler, uv, view.mip_bias);
     }
 #endif
 
@@ -74,7 +74,7 @@ fn fragment(
         var emissive: vec4<f32> = pbr_bindings::material.emissive;
 #ifdef VERTEX_UVS
         if ((pbr_bindings::material.flags & pbr_types::STANDARD_MATERIAL_FLAGS_EMISSIVE_TEXTURE_BIT) != 0u) {
-            emissive = vec4<f32>(emissive.rgb * textureSampleBias(pbr_bindings::emissive_texture, pbr_bindings::emissive_sampler, in.uv, view.mip_bias).rgb, 1.0);
+            emissive = vec4<f32>(emissive.rgb * textureSampleBias(pbr_bindings::emissive_texture, pbr_bindings::emissive_sampler, uv, view.mip_bias).rgb, 1.0);
         }
 #endif
         pbr_input.material.emissive = emissive;
@@ -83,7 +83,7 @@ fn fragment(
         var perceptual_roughness: f32 = pbr_bindings::material.perceptual_roughness;
 #ifdef VERTEX_UVS
         if ((pbr_bindings::material.flags & pbr_types::STANDARD_MATERIAL_FLAGS_METALLIC_ROUGHNESS_TEXTURE_BIT) != 0u) {
-            let metallic_roughness = textureSampleBias(pbr_bindings::metallic_roughness_texture, pbr_bindings::metallic_roughness_sampler, in.uv, view.mip_bias);
+            let metallic_roughness = textureSampleBias(pbr_bindings::metallic_roughness_texture, pbr_bindings::metallic_roughness_sampler, uv, view.mip_bias);
             // Sampling from GLTF standard channels for now
             metallic = metallic * metallic_roughness.b;
             perceptual_roughness = perceptual_roughness * metallic_roughness.g;
@@ -96,7 +96,7 @@ fn fragment(
         var occlusion: vec3<f32> = vec3(1.0);
 #ifdef VERTEX_UVS
         if ((pbr_bindings::material.flags & pbr_types::STANDARD_MATERIAL_FLAGS_OCCLUSION_TEXTURE_BIT) != 0u) {
-            occlusion = vec3(textureSampleBias(pbr_bindings::occlusion_texture, pbr_bindings::occlusion_sampler, in.uv, view.mip_bias).r);
+            occlusion = vec3(textureSampleBias(pbr_bindings::occlusion_texture, pbr_bindings::occlusion_sampler, uv, view.mip_bias).r);
         }
 #endif
 #ifdef SCREEN_SPACE_AMBIENT_OCCLUSION