multi: rename to FailureReasonPaymentDetails

Prior name is too long XD

routing/control_tower.go

@@ -142,7 +142,7 @@ func createFailedResult(rt *route.Route,
 
 	// In case of incorrect payment details, set the route. This can be used
 	// for probing and to extract a fee estimate from the route.
-	if reason == channeldb.FailureReasonIncorrectPaymentDetails {
+	if reason == channeldb.FailureReasonPaymentDetails {
 		result.Route = rt
 	}
 

routing/result_interpretation.go

@@ -11,7 +11,7 @@ import (
 // Instantiate variables to allow taking a reference from the failure reason.
 var (
 	reasonError            = channeldb.FailureReasonError
-	reasonIncorrectDetails = channeldb.FailureReasonIncorrectPaymentDetails
+	reasonIncorrectDetails = channeldb.FailureReasonPaymentDetails
 )
 
 // pairResult contains the result of the interpretation of a payment attempt for