### 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)

} else {
				from += get_datatype_name(type);
			}
			from += "[";
			from += itos(array_size);
			from += "]'";
			String to;
			if (type == TYPE_STRUCT) {
				to += p_struct_name;
			} else {
				to += get_datatype_name(p_type);
			}
			to += "[";
			to += itos(p_array_size);
			to += "]'";
			_set_error(vformat(RTR("Cannot convert from '%s' to '%s'."), from, to));
			return nullptr;
		}
	}
	ArrayConstructNode *an = alloc_node<ArrayConstructNode>();
	an->datatype = p_type;
	an->struct_name = p_struct_name;
	if (tk.type == TK_PARENTHESIS_OPEN || auto_size) { 
		while (true) {
			Node *n = _parse_and_reduce_expression(p_block, p_function_info);
			if (!n) {
				return nullptr;
			}
			if (!_compare_datatypes(p_type, p_struct_name, 0, n->get_datatype(), n->get_datatype_name(), n->get_array_size())) {
				return nullptr;