Merge pull request #9246 from GMagician/2.0.x-bed-temp-limit-fix

[2.0.x] Standardized max temp values

Marlin/src/lcd/ultralcd.cpp

       MENU_BACK(MSG_UBL_BUILD_MESH_MENU);
       MENU_ITEM_EDIT(int3, MSG_UBL_CUSTOM_HOTEND_TEMP, &custom_hotend_temp, EXTRUDE_MINTEMP, (HEATER_0_MAXTEMP - 10));
       #if HAS_TEMP_BED
-        MENU_ITEM_EDIT(int3, MSG_UBL_CUSTOM_BED_TEMP, &custom_bed_temp, BED_MINTEMP, (BED_MAXTEMP - 5));
+        MENU_ITEM_EDIT(int3, MSG_UBL_CUSTOM_BED_TEMP, &custom_bed_temp, BED_MINTEMP, (BED_MAXTEMP - 15));
       #endif
       MENU_ITEM(function, MSG_UBL_BUILD_CUSTOM_MESH, _lcd_ubl_build_custom_mesh);
       END_MENU();