Option to disable Total Time for widget

[OpenRift412]

I think while having the total cumulative time is nice, I think it would be a nice option to let users disable it. Since we already have options to fine-tune the level stats display, having this for the timer seems fitting enough.

I was also thinking about having this option decide whether or not the total time is displayed at the level-end screen (options being on, level-end only, and off), but I don't feel super strongly on it so we can take or leave that idea.