routing: fix MC probability order for blinded paths

Fix the blinded path probability sorting function.
Also fix the test assertion function.

routing/router.go

@@ -746,7 +746,7 @@ func (r *ChannelRouter) FindBlindedPaths(destination route.Vertex,
 
 	// Sort the routes based on probability.
 	sort.Slice(routes, func(i, j int) bool {
-		return routes[i].probability < routes[j].probability
+		return routes[i].probability > routes[j].probability
 	})
 
 	// Now just choose the best paths up until the maximum number of allowed

routing/router_test.go

@@ -3150,7 +3150,7 @@ func TestFindBlindedPathsWithMC(t *testing.T) {
 		}
 
 		for i, path := range expectedPaths {
-			require.Equal(t, expectedPaths[i], path)
+			require.Equal(t, path, actualPaths[i])
 		}
 	}