contractcourt: init BudgetConfig in unit tests

contractcourt/commit_sweep_resolver_test.go

@@ -42,6 +42,7 @@ func newCommitSweepResolverTestContext(t *testing.T,
 		ChainArbitratorConfig: ChainArbitratorConfig{
 			Notifier: notifier,
 			Sweeper:  sweeper,
+			Budget:   *DefaultBudgetConfig(),
 		},
 		PutResolverReport: func(_ kvdb.RwTx,
 			_ *channeldb.ResolverReport) error {