Merge pull request #8270 from studiodyne/studiodyne-fw

 fwretract bug/mistake + suggestion

Marlin/src/feature/fwretract.cpp

   else {
     // If a hop was done and Z hasn't changed, undo the Z hop
     if (hop_amount) {
-      current_position[Z_AXIS] -= retract_zlift;          // Pretend current pos is lower. Next move raises Z.
+      current_position[Z_AXIS] += retract_zlift;          // Pretend current pos is lower. Next move raises Z.
       SYNC_PLAN_POSITION_KINEMATIC();                     // Set the planner to the new position
       feedrate_mm_s = planner.max_feedrate_mm_s[Z_AXIS];  // Z feedrate to max
       prepare_move_to_destination();                      // Raise up to the old current pos