Vulkan: Normal maps in 3D don't work

[Xartorx]

Godot version:
7a16efc

OS/device including version:
Windows 10 / Nvidia GeForce GTX 1080 Ti (457.30) / Vulkan

Issue description:
Enabling "Normal Maps" on materials doesn't work and leads to render problems, and spams console with errors

Steps to reproduce:

1. Load project
2. Enable "Normal Map" on new_standardmaterial3d.tres material
3. Look at the console

Minimal reproduction project:
Test.zip

[clayjohn]

Introduced by: #44614

This line renames NORMAL_MAP_DEPTH to normal_map_depth

godot/servers/rendering/renderer_rd/renderer_scene_render_forward.cpp

Line 2871 in ec99c81

actions.renames["NORMAL_MAP_DEPTH"] = "normal_map_depth";

While the shader expects a variable named normal_depth

godot/servers/rendering/renderer_rd/shaders/scene_forward.glsl

Line 1858 in ec99c81

float normal_depth = 1.0;

The solution is to rename the variable in the shader to normal_map_depth here:

godot/servers/rendering/renderer_rd/shaders/scene_forward.glsl

Line 1858 in ec99c81

float normal_depth = 1.0;

and here:

godot/servers/rendering/renderer_rd/shaders/scene_forward.glsl

Line 1934 in ec99c81

normal = normalize(mix(normal, tangent * normal_map.x + binormal * normal_map.y + normal * normal_map.z, normal_depth));