### 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)

index++;
				comment_line_open = line;
				comments_open++;
				while (advance('*')) {
					if (peek() == '/') { 
						comments_open--;
						index++;
						break;
					}
				}
			} else {
				stripped.push_back(c);
			}
		} else if (c == '*' && strings_open == 0) {
			if (peek() == '/') { 
				comment_line_open = line;
				comments_open--;
			} else {
				stripped.push_back(c);
			}
		} else if (c == '\n') {
			line++;
			stripped.push_back(c);
		} else {
			stripped.push_back(c);
		}
	}
	return vector_to_string(stripped);
}
ShaderPreprocessor::CommentRemover::CommentRemover(const String &p_code) {