Merge pull request #4476 from otvald/RCBugFix

FIX for endstop adjustemt on delta is offset

Marlin/Marlin_main.cpp

   // Move slowly towards the endstop until triggered
   line_to_axis_pos(axis, 2 * home_bump_mm(axis) * axis_home_dir, get_homing_bump_feedrate(axis));
 
+  // reset current_position to 0 to reflect hitting endpoint
+  current_position[axis] = 0;
+  sync_plan_position();
+
   #if ENABLED(DEBUG_LEVELING_FEATURE)
     if (DEBUGGING(LEVELING)) DEBUG_POS("> TRIGGER ENDSTOP", current_position);
   #endif
         lockZ1 = (z_endstop_adj < 0);
 
       if (lockZ1) stepper.set_z_lock(true); else stepper.set_z2_lock(true);
-      sync_plan_position();
 
       // Move to the adjusted endstop height
       line_to_axis_pos(axis, adj);
   #if ENABLED(DELTA)
     // retrace by the amount specified in endstop_adj
     if (endstop_adj[axis] * axis_home_dir < 0) {
-      sync_plan_position();
       #if ENABLED(DEBUG_LEVELING_FEATURE)
         if (DEBUGGING(LEVELING)) {
           SERIAL_ECHOPAIR("> endstop_adj = ", endstop_adj[axis]);