fix tests (#5416)

substrate/frame/timestamp/src/lib.rs

@@ -250,7 +250,7 @@ impl<T: Trait> UnixTime for Module<T> {
 		// now is duration since unix epoch in millisecond as documented in
 		// `sp_timestamp::InherentDataProvider`.
 		let now = Self::now();
-		sp_std::if_std! { 
+		sp_std::if_std! {
 			if now == T::Moment::zero() {
 				debug::error!(
 					"`pallet_timestamp::UnixTime::now` is called at genesis, invalid value returned: 0"