bevy_pbr2: Correct detection of an orthographic projection

A projection is not orthographic if the view projection matrix bottom-right
element is 1.0, rather if the projection matrix bottom-right value is 1.0.
Now the projection matrix is bound, this fix is possible.

pipelined/bevy_pbr2/src/render/pbr.wgsl

@@ -539,7 +539,7 @@ fn fragment(in: FragmentInput) -> [[location(0)]] vec4<f32> {
         // #    endif
 
         var V: vec3<f32>;
-        if (view.view_proj.w.w != 1.0) { // If the projection is not orthographic
+        if (view.projection.w.w != 1.0) { // If the projection is not orthographic
             // Only valid for a perpective projection
             V = normalize(view.world_position.xyz - in.world_position.xyz);
         } else {