contractcourt: remove the immediate param used in Resolve

This `immediate` flag was added as a hack so during a restart, the
pending resolvers would offer the inputs to the sweeper and ask it to
sweep them immediately. This is no longer need due to `blockbeat`, as
now during restart, a block is always sent to all subsystems via the
flow `ChainArb` -> `ChannelArb` -> resolvers -> sweeper. Thus, when
there are pending inputs offered, they will be processed by the sweeper
immediately.

contractcourt/breach_resolver.go

@@ -47,7 +47,7 @@ func (b *breachResolver) ResolverKey() []byte {
 // been broadcast.
 //
 // TODO(yy): let sweeper handle the breach inputs.
-func (b *breachResolver) Resolve(_ bool) (ContractResolver, error) {
+func (b *breachResolver) Resolve() (ContractResolver, error) {
 	if !b.subscribed {
 		complete, err := b.SubscribeBreachComplete(
 			&b.ChanPoint, b.replyChan,