### 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)

uniform.type = type;
					uniform.scope = uniform_scope;
					uniform.precision = precision;
					uniform.array_size = array_size;
					uniform.group = current_uniform_group_name;
					uniform.subgroup = current_uniform_subgroup_name;
					tk = _get_token();
					if (tk.type == TK_BRACKET_OPEN) {
						Error error = _parse_array_size(nullptr, constants, true, nullptr, &uniform.array_size, nullptr);
						if (error != OK) {
							return error;
						}
						tk = _get_token();
					}
					if (is_sampler_type(type)) {
						if (uniform_scope == ShaderNode::Uniform::SCOPE_INSTANCE) {
							_set_error(vformat(RTR("The '%s' qualifier is not supported for sampler types."), "SCOPE_INSTANCE"));
							return ERR_PARSE_ERROR;
						}
						uniform.texture_order = texture_uniforms++;
						uniform.texture_binding = texture_binding;
						if (uniform.array_size > 0) {
							texture_binding += uniform.array_size;
						} else {
							++texture_binding;
						}
						uniform.order = -1;
					} else {
						if (uniform_scope == ShaderNode::Uniform::SCOPE_INSTANCE && (type == TYPE_MAT2 || type == TYPE_MAT3 || type == TYPE_MAT4)) {
							_set_error(vformat(RTR("The '%s' qualifier is not supported for matrix types."), "SCOPE_INSTANCE"));