### 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 (warnings.size() > 0 || last_compile_result != OK) {
			warnings_panel->clear();
		}
		warnings.clear();
		for (List<ShaderWarning>::Element *E = sl.get_warnings_ptr(); E; E = E->next()) {
			warnings.push_back(E->get());
		}
		if (warnings.size() > 0 && last_compile_result == OK) {
			warnings.sort_custom<WarningsComparator>();
			_update_warning_panel();
		} else {
			set_warning_count(0);
		}
	}
	emit_signal(SNAME("script_validated"), last_compile_result == OK); 
}
void ShaderTextEditor::_update_warning_panel() {
	int warning_count = 0;
	warnings_panel->push_table(2);
	for (int i = 0; i < warnings.size(); i++) {
		ShaderWarning &w = warnings[i];
		if (warning_count == 0) {
			if (saved_treat_warning_as_errors) {
				String error_text = "error(" + itos(w.get_line()) + "): " + w.get_message() + " " + TTR("Warnings should be fixed to prevent errors.");
				set_error_pos(w.get_line() - 1, 0);
				set_error(error_text);
				get_text_editor()->set_line_background_color(w.get_line() - 1, marked_line_color);
			}
		}
		warning_count++;