Enable ZigZag AutoBedLeveling on Deltas (PR#2273)

ZigZag has been disabled by fault due to do_topography_map

Marlin/Marlin_main.cpp

           // If do_topography_map is set then don't zig-zag. Just scan in one direction.
           // This gets the probe points in more readable order.
           if (!do_topography_map) zig = !zig;
+        #else
+          zig = !zig;
         #endif
 
         for (int xCount = xStart; xCount != xStop; xCount += xInc) {