showRewardAds function
Implementation
showRewardAds({Function? callback, Function? onFailedCallback}) async {
showProgressbarDialog(Get.context!);
loadRewardAds(
onAdLoadedCallback: () => {Get.back(), _showRewardedAd(callback)},
onAdFailedCallback: () => {
Get.back(),
if (onFailedCallback != null) {onFailedCallback()}
});
}