### 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)

[[fallthrough]];
												case ShaderNode::Varying::STAGE_FRAGMENT:
													if (!is_out_arg) {
														if (current_function != varying_function_names.fragment && current_function != varying_function_names.light) {
															error = true;
														}
													} else if (current_function != varying_function_names.fragment) { 
														error = true;
													}
													break;
												default:
													break;
											}
											if (error) {
												_set_error(vformat(RTR("Varying '%s' cannot be passed for the '%s' parameter in that context."), varname, _get_qualifier_str(arg_qual)));
												return nullptr;
											}
										}
									}
									bool is_const_arg = call_function->arguments[i].is_const;
									if (is_const_arg || is_out_arg) {
										StringName varname;
										if (n->type == Node::TYPE_CONSTANT || n->type == Node::TYPE_OPERATOR || n->type == Node::TYPE_ARRAY_CONSTRUCT) {
											if (!is_const_arg) {
												error = true;
											}
										} else if (n->type == Node::TYPE_ARRAY) {
											ArrayNode *an = static_cast<ArrayNode *>(n);
											if (!is_const_arg && (an->call_expression != nullptr || an->is_const)) {
												error = true;