Fix stepper directions after M501/M502

See https://github.com/MarlinFirmware/Marlin/issues/11103#issuecomment-421387611

Co-Authored-By: tcm0116 <tcm0116@users.noreply.github.com>

Marlin/src/module/stepper_indirection.cpp

 
 #include "../inc/MarlinConfig.h"
 
+#include "../module/stepper.h"
+
 //
 // TMC26X Driver objects and inits
 //
   #if HAS_DRIVER(L6470)
     L6470_init_to_defaults();
   #endif
+  stepper.set_directions();
 }
 
 //