### 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)

MemberNode *mn = alloc_node<MemberNode>();
				mn->basetype = dt;
				mn->basetype_const = is_const;
				mn->datatype = member_type;
				mn->base_struct_name = st;
				mn->struct_name = member_struct_name;
				mn->array_size = array_size;
				mn->name = ident;
				mn->owner = expr;
				mn->has_swizzling_duplicates = repeated;
				if (array_size > 0) {
					TkPos prev_pos = _get_tkpos();
					tk = _get_token();
					if (tk.type == TK_OP_ASSIGN) {
						if (last_type == IDENTIFIER_CONSTANT) {
							_set_error(RTR("Constants cannot be modified."));
							return nullptr;
						}
						Node *assign_expression = _parse_array_constructor(p_block, p_function_info, member_type, member_struct_name, array_size);
						if (!assign_expression) {
							return nullptr;
						}
						mn->assign_expression = assign_expression;
					} else if (tk.type == TK_PERIOD) {
						completion_class = TAG_ARRAY;
						if (p_block != nullptr) {
							p_block->block_tag = SubClassTag::TAG_ARRAY;
						}
						mn->call_expression = _parse_and_reduce_expression(p_block, p_function_info);
						if (p_block != nullptr) {