### Godot version

v4.0.beta15.official [4fa6edc88]

### System information

Windows 10 (10.0.19045 Build 19045) | Forward+ | Vulkan API 1.3.206 | AMD Radeon RX 6800 XT

### Issue description

If there is a function with arguments within a `.gdshaderinc` file, then this function can not be used in other shaders that include this via a relative include. The error in the other shaders is "Too many arguments for "example()" call. Expected at most 0 but received 1". Using an absolute path for the include resolves the error.

**Note:** The relative include *does* work in the special case of both files being in the project root.

### Steps to reproduce

1. Put a shader and a shader-include file into a subdirectory
2. Write a function with arguments in the shader-include file
3. Include that file in the shader
4. Try to use the function

### Minimal reproduction project

[shader-include-bug.zip](https://github.com/godotengine/godot/files/10508745/shader-include-bug.zip)

Ref<Shader> rel_shader = ResourceLoader::load(shader->get_path(), shader->get_class(), ResourceFormatLoader::CACHE_MODE_IGNORE);
	ERR_FAIL_COND(!rel_shader.is_valid());
	shader_editor->set_block_shader_changed(true);
	shader->set_code(rel_shader->get_code());
	shader_editor->set_block_shader_changed(false);
	shader->set_last_modified_time(rel_shader->get_last_modified_time());
	shader_editor->reload_text();
}
void TextShaderEditor::_reload_shader_include_from_disk() {
	Ref<ShaderInclude> rel_shader_include = ResourceLoader::load(shader_inc->get_path(), shader_inc->get_class(), ResourceFormatLoader::CACHE_MODE_IGNORE);
	ERR_FAIL_COND(!rel_shader_include.is_valid());
	shader_editor->set_block_shader_changed(true);
	shader_inc->set_code(rel_shader_include->get_code());
	shader_editor->set_block_shader_changed(false);
	shader_inc->set_last_modified_time(rel_shader_include->get_last_modified_time());
	shader_editor->reload_text();
}
void TextShaderEditor::_reload() {