Set OnTimestampSet = Aura in all runtimes (#1876)

parachain-template/runtime/src/lib.rs

@@ -316,7 +316,7 @@ parameter_types! {
 impl pallet_timestamp::Config for Runtime {
 	/// A timestamp: milliseconds since the unix epoch.
 	type Moment = u64;
-	type OnTimestampSet = ();
+	type OnTimestampSet = Aura;
 	type MinimumPeriod = MinimumPeriod;
 	type WeightInfo = ();
 }