### 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)

StringName func_name = parent_function->name;
						if (!used_local_vars.has(func_name)) {
							used_local_vars.insert(func_name, HashMap<StringName, Usage>());
						}
						used_local_vars[func_name].insert(name, Usage(tk_line));
					}
				}
#endif 
				BlockNode::Variable var;
				var.type = type;
				var.precision = precision;
				var.line = tk_line;
				var.array_size = array_size;
				var.is_const = is_const;
				var.struct_name = struct_name;
				tk = _get_token();
				if (tk.type == TK_BRACKET_OPEN) {
					Error error = _parse_array_size(p_block, p_function_info, false, &decl.size_expression, &var.array_size, &unknown_size);
					if (error != OK) {
						return error;
					}
					decl.size = var.array_size;
					array_size = var.array_size;
					tk = _get_token();
				}
#ifdef DEBUG_ENABLED
				if (var.type == DataType::TYPE_BOOL) {
					keyword_completion_context = CF_BOOLEAN;
				}
#endif