Fixed #317

Marlin/ConfigurationStore.cpp

 #ifdef PIDTEMP
     Kp = DEFAULT_Kp;
     Ki = (DEFAULT_Ki*PID_dT);
-    Kd = (DEFAULT_Kp/PID_dT);
+    Kd = (DEFAULT_Kd/PID_dT);
 #ifdef PID_ADD_EXTRUSION_RATE
     Kc = DEFAULT_Kc;
 #endif//PID_ADD_EXTRUSION_RATE