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/htlc_incoming_contest_resolver.go

@@ -90,9 +90,7 @@ func (h *htlcIncomingContestResolver) processFinalHtlcFail() error {
 //     as we have no remaining actions left at our disposal.
 //
 // NOTE: Part of the ContractResolver interface.
-func (h *htlcIncomingContestResolver) Resolve(
-	_ bool) (ContractResolver, error) {
-
+func (h *htlcIncomingContestResolver) Resolve() (ContractResolver, error) {
 	// If we're already full resolved, then we don't have anything further
 	// to do.
 	if h.resolved {