Fix pointer-to-string issues with set_home_offsets and _lcd_level_bed_homing

Marlin/ultralcd.cpp

         babystepsTodo[axis] += distance;
       #endif
     }
-    if (lcdDrawUpdate) lcd_implementation_drawedit(msg, PSTR(""));
+    if (lcdDrawUpdate) lcd_implementation_drawedit(msg, "");
     if (LCD_CLICKED) lcd_goto_previous_menu();
   }
 
    * MBL Move to mesh starting point
    */
   static void _lcd_level_bed_homing() {
-    if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR("XYZ"), PSTR(MSG_LEVEL_BED_HOMING));
+    if (lcdDrawUpdate) lcd_implementation_drawedit(PSTR("XYZ"), MSG_LEVEL_BED_HOMING);
     if (axis_known_position[X_AXIS] && axis_known_position[Y_AXIS] && axis_known_position[Z_AXIS]) {
       current_position[Z_AXIS] = MESH_HOME_SEARCH_Z;
       plan_set_position(current_position[X_AXIS], current_position[Y_AXIS], current_position[Z_AXIS], current_position[E_AXIS]);