### 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 if (decl.initializer.size() != var.array_size) {
									_set_error(RTR("Array size mismatch."));
									return ERR_PARSE_ERROR;
								}
								tk = _get_token();
							}
						}
					} else {
						if (unknown_size) {
							_set_error(RTR("Expected array initialization."));
							return ERR_PARSE_ERROR;
						}
						if (is_const) {
							_set_error(RTR("Expected initialization of constant."));
							return ERR_PARSE_ERROR;
						}
					}
					array_size = var.array_size;
				} else if (tk.type == TK_OP_ASSIGN) {
					
					Node *n = _parse_and_reduce_expression(p_block, p_function_info);
					if (!n) {
						return ERR_PARSE_ERROR;
					}
					if (is_const && n->type == Node::TYPE_OPERATOR && static_cast<OperatorNode *>(n)->op == OP_CALL) {
						OperatorNode *op = static_cast<OperatorNode *>(n);
						for (int i = 1; i < op->arguments.size(); i++) {
							if (!_check_node_constness(op->arguments[i])) {
								_set_error(vformat(RTR("Expected constant expression for argument %d of function call after '='."), i - 1));
								return ERR_PARSE_ERROR;