Make able to only break light-block when holding light-item

Because of the delay after the breaking of the nomally invisible light block and the decay of the sprite when broken, i can somtimes be hard or annoying as you break other blocks you would not want to.

Since you can only see the light-block-sprite-indicator when holding a light item, i suggest that when holding said item you are also only able to break the lightblock by default excluding all other blocks.