### 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)

const int line = p_tokenizer->get_line();
	p_tokenizer->advance('"');
	String path = tokens_to_string(p_tokenizer->advance('"'));
	for (int i = 0; i < path.length(); i++) {
		if (path[i] == '\n') {
			break; 
		}
		if (path[i] == CURSOR) {
			state->completion_type = COMPLETION_TYPE_INCLUDE_PATH;
			break;
		}
	}
	path = path.substr(0, path.length() - 1);
	if (path.is_empty() || !p_tokenizer->consume_empty_line()) {
		set_error(RTR("Invalid path."), line);