store: Cut commented-out reactrotron code.
store: Cut commented-out reactrotron code.

I'm not aware of anyone using this recently, so it may already
have bitrotted; in any case we're about to rework this code to
use redux-persist v5 and then it will definitely bitrot.  Cut it
out instead.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile