Fix MBL line_to_destination

Fix #10708

Marlin/src/feature/bedlevel/mbl/mesh_bed_leveling.h

     ;
   }
 
-  // Support functions, which may be embedded in the class later
   #if IS_CARTESIAN && DISABLED(SEGMENT_LEVELED_MOVES)
-    void line_to_destination(const float fr_mm_s, uint8_t x_splits=0xFF, uint8_t y_splits=0xFF);
+    static void line_to_destination(const float fr_mm_s, uint8_t x_splits=0xFF, uint8_t y_splits=0xFF);
   #endif
 };
 

Marlin/src/module/motion.cpp

            */
           if (current_position[X_AXIS] != destination[X_AXIS] || current_position[Y_AXIS] != destination[Y_AXIS]) {
             #if ENABLED(MESH_BED_LEVELING)
-              mesh_line_to_destination(MMS_SCALED(feedrate_mm_s));
+              mbl.line_to_destination(MMS_SCALED(feedrate_mm_s));
             #elif ENABLED(AUTO_BED_LEVELING_BILINEAR)
               bilinear_line_to_destination(MMS_SCALED(feedrate_mm_s));
             #endif