FIX: fix build error

jira: none
Change-Id: I97df69b728fc3871b7c33e1fd3ba068e741d51c7
(cherry picked from commit 326d7d28b47017bdbd98873a6437ef84116291ba)

src/libslic3r/Config.hpp

@@ -30,7 +30,6 @@ namespace Slic3r {
     {
         double  value;
         bool    percent;
-
     private:
         friend class cereal::access;
         template<class Archive> void serialize(Archive& ar) { ar(this->value); ar(this->percent); }