### 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)

}
	last_compile_result = preprocessor.preprocess(code, filename, code_pp, &error_pp, &err_positions, &regions);
	for (int i = 0; i < get_text_editor()->get_line_count(); i++) {
		get_text_editor()->set_line_background_color(i, Color(0, 0, 0, 0));
	}
	syntax_highlighter->clear_disabled_branch_regions();
	for (const ShaderPreprocessor::Region &region : regions) {
		if (!region.enabled) {
			if (filename != region.file) {
				continue;
			}
			syntax_highlighter->add_disabled_branch_region(Point2i(region.from_line, region.to_line));
		}
	}
	set_error("");
	set_error_count(0);
	if (last_compile_result != OK) {
		
		ERR_FAIL_COND(err_positions.size() == 0);
		String err_text = error_pp;
		int err_line = err_positions.front()->get().line;
		if (err_positions.size() == 1) {
			
			err_text = "error(" + itos(err_line) + "): " + err_text;
		} else {
			err_text = "error(" + itos(err_line) + ") in include " + err_positions.back()->get().file.get_file() + ":" + itos(err_positions.back()->get().line) + ": " + err_text;
			set_error_count(err_positions.size() - 1);
		}
		set_error(err_text);
		set_error_pos(err_line - 1, 0);