Update pallet macro migrations. (#8766)

* Update pallet macro migrations.

* Revert dispatchable call visibility changes.

* fmt

substrate/frame/timestamp/src/lib.rs

@@ -183,7 +183,7 @@ pub mod pallet {
 			T::WeightInfo::set(),
 			DispatchClass::Mandatory
 		))]
-		pub(super) fn set(origin: OriginFor<T>, #[pallet::compact] now: T::Moment) -> DispatchResultWithPostInfo {
+		pub(super) fn set(origin: OriginFor<T>, #[pallet::compact] now: T::Moment) -> DispatchResult {
 			ensure_none(origin)?;
 			assert!(!DidUpdate::<T>::exists(), "Timestamp must be updated only once in the block");
 			let prev = Self::now();
@@ -196,7 +196,7 @@ pub mod pallet {
 
 			<T::OnTimestampSet as OnTimestampSet<_>>::on_timestamp_set(now);
 
-			Ok(().into())
+			Ok(())
 		}
 	}