Make sure ABL (manual) starts close to the bed

Marlin/src/gcode/bedlevel/abl/G29.cpp

@@ -468,10 +468,12 @@ void GcodeSuite::G29() {
     if (no_action) return;
 
     if (abl_probe_index == 0) {
-      // For the initial G29 save software endstop state
+      // For the initial G29 S2 save software endstop state
       #if HAS_SOFTWARE_ENDSTOPS
         enable_soft_endstops = soft_endstops_enabled;
       #endif
+      // Move close to the bed before the first point
+      do_blocking_move_to_z(Z_MIN_POS);
     }
     else {