### 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)

bool found = false;
					if (is_shader_inc) {
						for (int i = 0; i < RenderingServer::SHADER_MAX; i++) {
							const Vector<ModeInfo> modes = ShaderTypes::get_singleton()->get_modes(RenderingServer::ShaderMode(i));
							for (int j = 0; j < modes.size(); j++) {
								const ModeInfo &info = modes[j];
								const String name = String(info.name);
								if (smode.begins_with(name)) {
									if (!info.options.is_empty()) {
										if (info.options.has(smode.substr(name.length() + 1))) {
											found = true;
											if (defined_modes.has(name)) {
												_set_error(vformat(RTR("Redefinition of render mode: '%s'. The '%s' mode has already been set to '%s'."), smode, name, defined_modes[name]));
												return ERR_PARSE_ERROR;
											}
											defined_modes.insert(name, smode);
											break;
										}
									} else {
										found = true;
										break;
									}
								}
							}
						}
					} else {
						for (int i = 0; i < p_render_modes.size(); i++) {
							const ModeInfo &info = p_render_modes[i];
							const String name = String(info.name);
							if (smode.begins_with(name)) {