fix(settings): Fix reset button for legal and privacy

Signed-off-by: Joas Schilling <coding@schilljs.com>

Author: nickvergessen

apps/theming/lib/Controller/ThemingController.php

@@ -308,6 +308,8 @@ public function undo(string $setting): DataResponse {
 		$setting = match ($setting) {
 			'primaryColor' => 'primary_color',
 			'backgroundColor' => 'background_color',
+			'legalNoticeUrl' => 'imprintUrl',
+			'privacyPolicyUrl' => 'privacyUrl',
 			default => $setting,
 		};
 		$value = $this->themingDefaults->undo($setting);