### 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)

_load_theme_settings();
	get_text_editor()->set_text(p_code);
	get_text_editor()->clear_undo_history();
	get_text_editor()->call_deferred(SNAME("set_h_scroll"), 0);
	get_text_editor()->call_deferred(SNAME("set_v_scroll"), 0);
	get_text_editor()->tag_saved_version();
	_validate_script();
	_line_col_changed();
}
void ShaderTextEditor::reload_text() {
	ERR_FAIL_COND(shader.is_null());
	CodeEdit *te = get_text_editor();
	int column = te->get_caret_column();
	int row = te->get_caret_line();
	int h = te->get_h_scroll();
	int v = te->get_v_scroll();
	te->set_text(shader->get_code());
	te->set_caret_line(row);
	te->set_caret_column(column);
	te->set_h_scroll(h);
	te->set_v_scroll(v);
	te->tag_saved_version();
	update_line_and_column();
}
void ShaderTextEditor::set_warnings_panel(RichTextLabel *p_warnings_panel) {
	warnings_panel = p_warnings_panel;
}
void ShaderTextEditor::_load_theme_settings() {