### 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)

if (shader.is_valid()) {
		_reload_shader_from_disk();
	} else if (shader_inc.is_valid()) {
		_reload_shader_include_from_disk();
	}
}
void TextShaderEditor::edit(const Ref<Shader> &p_shader) {
	if (p_shader.is_null() || !p_shader->is_text_shader()) {
		return;
	}
	if (shader == p_shader) {
		return;
	}
	shader = p_shader;
	shader_inc = Ref<ShaderInclude>();
	shader_editor->set_edited_shader(shader);
}
void TextShaderEditor::edit(const Ref<ShaderInclude> &p_shader_inc) {
	if (p_shader_inc.is_null()) {
		return;
	}
	if (shader_inc == p_shader_inc) {
		return;
	}
	shader_inc = p_shader_inc;
	shader = Ref<Shader>();
	shader_editor->set_edited_shader_include(p_shader_inc);
}
void TextShaderEditor::save_external_data(const String &p_str) {