ARLINGTON — Is it the Whataburger Curse? Something doesn’t smell right at Globe Life Field lately. The Rangers offense has turned as limp as undercooked fries at home. Which brings us to our theory: Must have something to do with that brand-new Whataburger that went up on the concourse on the third base side of the park. It’s as good a reason as any. The Whataburger was not finished for the…