### 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)

break;
								}
								int min = builtin_func_const_args[constarg_idx].min;
								int max = builtin_func_const_args[constarg_idx].max;
								bool error = false;
								if (p_func->arguments[arg]->type == Node::TYPE_VARIABLE) {
									const VariableNode *vn = static_cast<VariableNode *>(p_func->arguments[arg]);
									bool is_const = false;
									ConstantNode::Value value;
									value.sint = -1;
									_find_identifier(p_block, false, p_function_info, vn->name, nullptr, nullptr, &is_const, nullptr, nullptr, &value);
									if (!is_const || value.sint < min || value.sint > max) {
										error = true;
									}
								} else {
									if (p_func->arguments[arg]->type == Node::TYPE_CONSTANT) {
										const ConstantNode *cn = static_cast<ConstantNode *>(p_func->arguments[arg]);
										if (cn->get_datatype() == TYPE_INT && cn->values.size() == 1) {
											int value = cn->values[0].sint;
											if (value < min || value > max) {
												error = true;
											}
										} else {
											error = true;
										}
									} else {
										error = true;
									}
								}
								if (error) {