Merge pull request #1986 from thinkyhead/fix_homing_zpos

Fix homing Z position

Marlin/Marlin_main.cpp

 
     // Set the axis position to its home position (plus home offsets)
     axis_is_at_home(axis);
+    sync_plan_position();
 
     destination[axis] = current_position[axis];
     feedrate = 0.0;