Fixing a struct-class inconsistency.

Author: HannesSommer

cuckoo_time_translator/include/cuckoo_time_translator/DeviceTimeTranslator.h

@@ -58,7 +58,7 @@ class NS {
   std::string nameSpace_;
 };
 
-class KalmanOwtConfig;
+struct KalmanOwtConfig;
 class OwtFactory;
 class OneWayTranslator;