### 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
shader_editor->update_editor_settings();
	shader_editor->get_text_editor()->add_theme_constant_override("line_spacing", EDITOR_GET("text_editor/appearance/whitespace/line_spacing"));
	shader_editor->get_text_editor()->set_draw_breakpoints_gutter(false);
	shader_editor->get_text_editor()->set_draw_executing_lines_gutter(false);
	trim_trailing_whitespace_on_save = EDITOR_GET("text_editor/behavior/files/trim_trailing_whitespace_on_save");
}
void TextShaderEditor::_show_warnings_panel(bool p_show) {
	warnings_panel->set_visible(p_show);
}
void TextShaderEditor::_warning_clicked(Variant p_line) {
	if (p_line.get_type() == Variant::INT) {
		shader_editor->get_text_editor()->set_caret_line(p_line.operator int64_t());
	}
}
void TextShaderEditor::_bind_methods() {
	ClassDB::bind_method("_show_warnings_panel", &TextShaderEditor::_show_warnings_panel);
	ClassDB::bind_method("_warning_clicked", &TextShaderEditor::_warning_clicked);
	ADD_SIGNAL(MethodInfo("validation_changed"));
}
void TextShaderEditor::ensure_select_current() {
}
void TextShaderEditor::goto_line_selection(int p_line, int p_begin, int p_end) {
	shader_editor->goto_line_selection(p_line, p_begin, p_end);
}
void TextShaderEditor::_project_settings_changed() {
	_update_warnings(true);
}
void TextShaderEditor::_update_warnings(bool p_validate) {