### 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)

String result = p_line;
	const String &key = p_define_pair->key();
	const Define *define = p_define_pair->value();
	int index_start = 0;
	int index = 0;
	if (find_match(result, key, index, index_start)) {
		String body = define->body;
		if (define->arguments.size() > 0) {
			
			int args_start = -1;
			int args_end = -1;
			int brackets_open = 0;
			Vector<String> args;
			for (int i = index_start - 1; i < p_line.length(); i++) {
				bool add_argument = false;
				bool reached_end = false;
				char32_t c = p_line[i];
				if (c == '(') {
					brackets_open++;