Remove extra G29 V newlines (#20955)

Marlin/src/feature/bedlevel/ubl/ubl_G29.cpp

         if (do_ubl_mesh_map) display_map(g29_map_type);
 
         const int point_num = (GRID_MAX_POINTS) - count + 1;
-        SERIAL_ECHOLNPAIR("\nProbing mesh point ", point_num, "/", int(GRID_MAX_POINTS), ".\n");
+        SERIAL_ECHOLNPAIR("Probing mesh point ", point_num, "/", int(GRID_MAX_POINTS), ".");
         TERN_(HAS_DISPLAY, ui.status_printf_P(0, PSTR(S_FMT " %i/%i"), GET_TEXT(MSG_PROBING_MESH), point_num, int(GRID_MAX_POINTS)));
 
         #if HAS_LCD_MENU