### 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)

bool use_autoreload = bool(EDITOR_GET("text_editor/behavior/files/auto_reload_scripts_on_external_change"));
	if (shader_inc.is_valid()) {
		if (shader_inc->get_last_modified_time() != FileAccess::get_modified_time(shader_inc->get_path())) {
			if (use_autoreload) {
				_reload_shader_include_from_disk();
			} else {
				disk_changed->call_deferred(SNAME("popup_centered"));
			}
		}
		return;
	}
	if (shader.is_null() || shader->is_built_in()) {
		return;
	}
	if (shader->get_last_modified_time() != FileAccess::get_modified_time(shader->get_path())) {
		if (use_autoreload) {
			_reload_shader_from_disk();
		} else {
			disk_changed->call_deferred(SNAME("popup_centered"));
		}
	}
}
void TextShaderEditor::_reload_shader_from_disk() {