### 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)

Dictionary color_map;
	for (const Point2i &region : disabled_branch_regions) {
		if (p_line >= region.x && p_line <= region.y) {
			Dictionary highlighter_info;
			highlighter_info["color"] = disabled_branch_color;
			color_map[0] = highlighter_info;
			return color_map;
		}
	}
	return CodeHighlighter::_get_line_syntax_highlighting_impl(p_line);
}
void GDShaderSyntaxHighlighter::add_disabled_branch_region(const Point2i &p_region) {
	ERR_FAIL_COND(p_region.x < 0);
	ERR_FAIL_COND(p_region.y < 0);
	for (int i = 0; i < disabled_branch_regions.size(); i++) {
		ERR_FAIL_COND_MSG(disabled_branch_regions[i].x == p_region.x, "Branch region with a start line '" + itos(p_region.x) + "' already exists.");
	}
	Point2i disabled_branch_region;
	disabled_branch_region.x = p_region.x;
	disabled_branch_region.y = p_region.y;
	disabled_branch_regions.push_back(disabled_branch_region);
	clear_highlighting_cache();
}
void GDShaderSyntaxHighlighter::clear_disabled_branch_regions() {