fix typo

c'n'p ftw :/

Marlin/Marlin_main.cpp

     // Set the Y position, if included
     if (code_seen(axis_codes[Y_AXIS]) && code_has_value()) {
       if (code_value_long() != 0) // filter 0
-        current_position[X_AXIS] = code_value();
+        current_position[Y_AXIS] = code_value();
     }
 
     // Home Z last if homing towards the bed
     // Set the Z position, if included
     if (code_seen(axis_codes[Z_AXIS]) && code_has_value()) {
       if (code_value_long() != 0) // filter 0
-        current_position[X_AXIS] = code_value();
+        current_position[Z_AXIS] = code_value();
     }
 
     #if defined(ENABLE_AUTO_BED_LEVELING) && (Z_HOME_DIR < 0)