### 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)

for (int i = expr_pos - 1; i >= next_op; i--) {
				OperatorNode *op = alloc_node<OperatorNode>();
				op->op = expression[i].op;
				if ((op->op == OP_INCREMENT || op->op == OP_DECREMENT) && !_validate_assign(expression[i + 1].node, p_function_info)) {
					_set_error(RTR("Can't use increment/decrement operator in a constant expression."));
					return nullptr;
				}
				op->arguments.push_back(expression[i + 1].node);
				expression.write[i].is_op = false;
				expression.write[i].node = op;
				if (!_validate_operator(op, &op->return_cache, &op->return_array_size)) {
					String at;
					for (int j = 0; j < op->arguments.size(); j++) {
						if (j > 0) {
							at += ", ";
						}
						at += get_datatype_name(op->arguments[j]->get_datatype());
						if (!op->arguments[j]->is_indexed() && op->arguments[j]->get_array_size() > 0) {
							at += "[";
							at += itos(op->arguments[j]->get_array_size());
							at += "]";
						}
					}
					_set_error(vformat(RTR("Invalid arguments to unary operator '%s': %s."), get_operator_text(op->op), at));
					return nullptr;
				}
				expression.remove_at(i + 1);
			}
		} else if (is_ternary) {