groupBY function of _ always returns nil

[wgaylord]

https://github.com/ValentinFunk/LibK/blob/master/lua/libk/shared/sh_underscore.lua#L308-L316

This function is not returning the value it should. For some reason it uses return all instead of return result this is part of what's breaking refunds (once you uncomment them) in Pointshop2