fix: start server when listening on socket

This fixes a regression introduced in daa7ad053c where the http server was not started when listening on a unix socket instead of a http interface.

Resolves https://github.com/go-vikunja/vikunja/issues/396

pkg/cmd/web.go

@@ -140,7 +140,6 @@ var webCmd = &cobra.Command{
 				if err := setupUnixSocket(e); err != nil {
 					e.Logger.Fatal(err)
 				}
-				return
 			}
 
 			err := e.Start(config.ServiceInterface.GetString())