contractcourt: make sure sweep happens immediately on startup

This commit makes sure the time-sensitive outputs are swept immediately
during startup.

contractcourt/commit_sweep_resolver_test.go

@@ -83,7 +83,7 @@ func (i *commitSweepResolverTestContext) resolve() {
 	// Start resolver.
 	i.resolverResultChan = make(chan resolveResult, 1)
 	go func() {
-		nextResolver, err := i.resolver.Resolve()
+		nextResolver, err := i.resolver.Resolve(false)
 		i.resolverResultChan <- resolveResult{
 			nextResolver: nextResolver,
 			err:          err,