Make filament display on dogm_... same as hitachi...

Thanks @MagoKimbra.

Marlin/dogm_lcd_implementation.h

       lcd_printPGM(PSTR("dia:"));
       lcd_print(ftostr12ns(filament_width_meas));
       lcd_printPGM(PSTR(" factor:"));
-      lcd_print(itostr3(extruder_multiply[active_extruder]));
+      lcd_print(itostr3(volumetric_multiplier[FILAMENT_SENSOR_EXTRUDER_NUM]));
       lcd_print('%');
     }
   #endif