### 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)

calltip += char32_t(0xFFFF);
						}
					}
					if (shader->functions[i].function->arguments.size()) {
						calltip += " ";
					}
					calltip += ")";
					r_call_hint = calltip;
					return OK;
				}
			}
			int idx = 0;
			String calltip;
			bool low_end = RenderingServer::get_singleton()->is_low_end();
			if (stages && stages->has(block_function)) {
				for (const KeyValue<StringName, StageFunctionInfo> &E : (*stages)[block_function].stage_functions) {
					if (completion_function == E.key) {
						calltip += get_datatype_name(E.value.return_type);
						calltip += " ";
						calltip += E.key;
						calltip += "(";
						for (int i = 0; i < E.value.arguments.size(); i++) {
							if (i > 0) {
								calltip += ", ";
							} else {
								calltip += " ";
							}
							if (i == completion_argument) {
								calltip += char32_t(0xFFFF);
							}