Combine update and download about shellsaber

[ominitay]

In my opinion, I think that downloading and updating mods should be separate. For example, it makes more sense to use the command shaber update all to update mods, rather than the command shaber download enabled; shaber download disabled. Also, most people would go for the update command when intending to update their mods, rather than the download command.

Overall, while technically feasible, I don't see a benefit to making this change. I'm open to being persuaded otherwise though :)