### Godot version

4.0.beta16

### System information

Windows 10 Pro x64, GLES3, RTX 3080 Ti (528.02)

### Issue description

In Compatibility/GLES3 back-end, shaders which use a uniform to get the normal roughness buffer cannot compile. For example, the shader:
```glsl
shader_type spatial;

uniform sampler2D normal_roughness_texture : hint_normal_roughness_texture;

void fragment() {
    vec4 sample = texture(normal_roughness_texture, UV);
}
```
results in an error in the output:
```
  drivers/gles3/shader_gles3.cpp:242 - SceneShaderGLES3: Fragment shader compilation failed:
  0(890) : error C1503: undefined variable "normal_roughness_buffer"
  
  drivers/gles3/shader_gles3.cpp:342 - Method/function failed.
```

If I switch over to the Mobile or Forward+ backends, there is no shader compilation error.

### Steps to reproduce

Open the attached reproduction in the 4.0.beta16 editor.

When the scene is opened, the error is produced automatically:
1. Open `scene.tscn`
2. Open Output to review error

When the scene is saved with any changes made to the shader, the same error is also produced:
1. Open `scene.tscn`
2. Open `example.gdshader` in the shader editor.
3. Make a compile-able change to the shader.
4. Save the scene
5. Open Output to review the error

### Minimal reproduction project

[NormalRoughnessTexture_GLES3_Error.zip](https://github.com/godotengine/godot/files/10534253/NormalRoughnessTexture_GLES3_Error.zip)

return ERR_PARSE_ERROR;
						}
						uniform.texture_order = -1;
						if (uniform_scope != ShaderNode::Uniform::SCOPE_INSTANCE) {
							uniform.order = uniforms++;
#ifdef DEBUG_ENABLED
							if (check_device_limit_warnings) {
								if (uniform.array_size > 0) {
									int size = get_datatype_size(uniform.type) * uniform.array_size;
									int m = (16 * uniform.array_size);
									if ((size % m) != 0U) {
										size += m - (size % m);
									}
									uniform_buffer_size += size;
								} else {
									uniform_buffer_size += get_datatype_size(uniform.type);
								}
								if (uniform_buffer_exceeded_line == -1 && uniform_buffer_size > max_uniform_buffer_size) {
									uniform_buffer_exceeded_line = tk_line;
								}
							}
#endif 
						}
					}
					if (uniform.array_size > 0) {
						if (uniform_scope == ShaderNode::Uniform::SCOPE_GLOBAL) {
							_set_error(vformat(RTR("The '%s' qualifier is not supported for uniform arrays."), "SCOPE_GLOBAL"));
							return ERR_PARSE_ERROR;
						}
						if (uniform_scope == ShaderNode::Uniform::SCOPE_INSTANCE) {