### Godot version

4.0.3

### System information

Win7

### Issue description

#if and #else highlighted with the color same as if and else shader statement:

![image](https://github.com/godotengine/godot/assets/28286958/c2d58151-d6d2-4305-b4da-36e76e316caf)


### Steps to reproduce

1. Create shader
2. Add #if and #else

### Minimal reproduction project

N/A
warnings_panel->push_cell();
		warnings_panel->add_text(w.get_message());
		warnings_panel->pop(); 
	}
	warnings_panel->pop(); 
	set_warning_count(warning_count);
}
void ShaderTextEditor::_bind_methods() {
	ADD_SIGNAL(MethodInfo("script_validated", PropertyInfo(Variant::BOOL, "valid")));
}
ShaderTextEditor::ShaderTextEditor() {
	syntax_highlighter.instantiate();
	get_text_editor()->set_syntax_highlighter(syntax_highlighter);
}
void TextShaderEditor::_menu_option(int p_option) {
	switch (p_option) {
		case EDIT_UNDO: {
			shader_editor->get_text_editor()->undo();
		} break;
		case EDIT_REDO: {
			shader_editor->get_text_editor()->redo();
		} break;
		case EDIT_CUT: {
			shader_editor->get_text_editor()->cut();
		} break;
		case EDIT_COPY: {
			shader_editor->get_text_editor()->copy();
		} break;
		case EDIT_PASTE: {