contractcourt: remove waitForHeight in resolvers

The sweeper can handle the waiting so there's no need to wait for blocks
inside the resolvers. By offering the inputs prior to their mature
heights also guarantees the inputs with the same deadline are
aggregated.

contractcourt/htlc_success_resolver_test.go

@@ -437,10 +437,6 @@ func TestHtlcSuccessSecondStageResolutionSweeper(t *testing.T) {
 					}
 				}
 
-				ctx.notifier.EpochChan <- &chainntnfs.BlockEpoch{
-					Height: 13,
-				}
-
 				// We expect it to sweep the second-level
 				// transaction we notfied about above.
 				resolver := ctx.resolver.(*htlcSuccessResolver)