Fix "Shorts Average Price" Calculation

@RandersonTexas pointed out to me that “shorts average price” in Mimir’s short interest command likely isn’t optimal. For instance, it’s currently reading that the average short in BEEM is in at the 52 week low, which very likely isn’t the case. In reality they’d be situated closer to the 52 week high than that and the true “average” is probably between those two points.

So with that in mind, we’re working on a better method of calculating this that should be better reflective of the true average.