routing: update to realistic test values

The bimodal model doesn't depend on the unit, which is why updating to
more realistic values doesn't require changes in tests.

We pin the scale in the fuzz test to not invalidate the corpus.

Author: bitromortac

routing/probability_bimodal_test.go

@@ -11,10 +11,10 @@ import (
 )
 
 const (
-	smallAmount = lnwire.MilliSatoshi(400_000)
-	largeAmount = lnwire.MilliSatoshi(5_000_000)
-	capacity    = lnwire.MilliSatoshi(10_000_000)
-	scale       = lnwire.MilliSatoshi(400_000)
+	smallAmount = lnwire.MilliSatoshi(400_000_000)
+	largeAmount = lnwire.MilliSatoshi(5_000_000_000)
+	capacity    = lnwire.MilliSatoshi(10_000_000_000)
+	scale       = lnwire.MilliSatoshi(400_000_000)
 )
 
 // TestSuccessProbability tests that we get correct probability estimates for
@@ -689,7 +689,7 @@ func TestLocalPairProbability(t *testing.T) {
 // FuzzProbability checks that we don't encounter errors related to NaNs.
 func FuzzProbability(f *testing.F) {
 	estimator := BimodalEstimator{
-		BimodalConfig: BimodalConfig{BimodalScaleMsat: scale},
+		BimodalConfig: BimodalConfig{BimodalScaleMsat: 400_000},
 	}
 
 	f.Fuzz(func(t *testing.T, capacity, successAmt, failAmt, amt uint64) {