nit: x/auction/keeper: Keeper.EndBlocker could succinctly use !sdk.Dec.IsPositive and not having to compare against a zero magnitude sdk.Dec

[odeke-em]

Noticed here that we've got this comparison

sommelier/x/auction/keeper/abci.go

Line 39 in 3157d97

if newUnitPriceInUsomm.LTE(sdk.NewDec(0)) {

but really that can be succinctly and cheaply be turned into !.IsPositive()