allow to specify schedule time as a relative value (#6578)

* allow to specify schedule time as a relative value

* bump version

* line width

* fix benchmarks

* rename and updates

substrate/frame/democracy/src/lib.rs

@@ -163,7 +163,7 @@ use frame_support::{
 	weights::{Weight, DispatchClass},
 	traits::{
 		Currency, ReservableCurrency, LockableCurrency, WithdrawReason, LockIdentifier, Get,
-		OnUnbalanced, BalanceStatus, schedule::Named as ScheduleNamed, EnsureOrigin
+		OnUnbalanced, BalanceStatus, schedule::{Named as ScheduleNamed, DispatchTime}, EnsureOrigin
 	},
 	dispatch::DispatchResultWithPostInfo,
 };
@@ -1688,7 +1688,7 @@ impl<T: Trait> Module<T> {
 
 				if T::Scheduler::schedule_named(
 					(DEMOCRACY_ID, index).encode(),
-					when,
+					DispatchTime::At(when),
 					None,
 					63,
 					system::RawOrigin::Root.into(),