### 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)

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		if (!is_whitespace(c)) {
			p_started = true;
		}
		char32_t n = next();
		if (n == CURSOR) {
			if (r_is_cursor != nullptr) {
				*r_is_cursor = true;
			}
		} else {
			if (p_started) {
				text.push_back(n);
			}
		}
	}
	String id = vector_to_string(text);
	if (!id.is_valid_identifier()) {
		return "";
	}
	return id;
}
String ShaderPreprocessor::Tokenizer::peek_identifier() {
	const int original = index;
	const int original_line = line;
	String id = get_identifier();
	index = original;
	line = original_line;
	return id;
}
ShaderPreprocessor::Token ShaderPreprocessor::Tokenizer::get_token() {