### 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)

{
		int bracket_start_count = 0;
		int bracket_end_count = 0;
		for (int i = 0; i < p_string.size(); i++) {
			switch (p_string[i]) {
				case CURSOR:
					state->completion_type = COMPLETION_TYPE_CONDITION;
					break;
				case '(':
					bracket_start_count++;
					break;
				case ')':
					bracket_end_count++;
					break;
			}
		}
		if (bracket_start_count > bracket_end_count) {
			_set_expected_error(")", p_line);
			return FAILED;
		}
		if (bracket_end_count > bracket_start_count) {
			_set_expected_error("(", p_line);
			return FAILED;
		}
	}
	String result = p_string;