liquidity: update default budget to use flat fee percentage

liquidity/liquidity.go

@@ -83,12 +83,9 @@ var (
 	// only be used for automatically dispatched swaps if autoloop is
 	// explicitly enabled, so we are happy to set a non-zero value here. The
 	// amount chosen simply uses the current defaults to provide budget for
-	// a single swap. We don't have a swap amount to calculate our maximum
-	// routing fee, so we use 0.16 BTC for now.
-	defaultBudget = defaultMaximumMinerFee +
-		ppmToSat(funding.MaxBtcFundingAmount, defaultSwapFeePPM) +
-		ppmToSat(defaultMaximumPrepay, defaultPrepayRoutingFeePPM) +
-		ppmToSat(funding.MaxBtcFundingAmount, defaultRoutingFeePPM)
+	// a single swap. We don't have a swap amount so we just use our max
+	// funding amount.
+	defaultBudget = ppmToSat(funding.MaxBtcFundingAmount, defaultFeePPM)
 
 	// defaultParameters contains the default parameters that we start our
 	// liquidity manger with.

liquidity/liquidity_test.go

@@ -622,6 +622,13 @@ func TestSweepFeeLimit(t *testing.T) {
 			params := defaultParameters
 			params.FeeLimit = defaultFeeCategoryLimit()
 
+			// Set our budget to cover a single swap with these
+			// parameters.
+			params.AutoFeeBudget = defaultMaximumMinerFee +
+				ppmToSat(7500, defaultSwapFeePPM) +
+				ppmToSat(7500, defaultPrepayRoutingFeePPM) +
+				ppmToSat(7500, defaultRoutingFeePPM)
+
 			params.ChannelRules = map[lnwire.ShortChannelID]*ThresholdRule{
 				chanID1: chanRule,
 			}
@@ -855,6 +862,13 @@ func TestFeeLimits(t *testing.T) {
 			params := defaultParameters
 			params.FeeLimit = defaultFeeCategoryLimit()
 
+			// Set our budget to cover a single swap with these
+			// parameters.
+			params.AutoFeeBudget = defaultMaximumMinerFee +
+				ppmToSat(7500, defaultSwapFeePPM) +
+				ppmToSat(7500, defaultPrepayRoutingFeePPM) +
+				ppmToSat(7500, defaultRoutingFeePPM)
+
 			params.ChannelRules = map[lnwire.ShortChannelID]*ThresholdRule{
 				chanID1: chanRule,
 			}