reformat code (#2019)

* reformat code

This is mostly an automated change with `make lint`.
I had to manually please golangci-lint in routes_test because of a short
variable name.

* fix start -> strategy which was wrongly corrected by linter

hscontrol/db/routes.go

@@ -542,7 +542,6 @@ func failoverRoute(
 	isLikelyConnected *xsync.MapOf[types.NodeID, bool],
 	routeToReplace *types.Route,
 	altRoutes types.Routes,
-
 ) *failover {
 	if routeToReplace == nil {
 		return nil