Fix/update demo store

[wychoong]

change demo store checkout to use cash-in-hand payment type to ease the setup without stripe

[alecritson]

Thanks @wychoong We'll take a look, however it seems like there's some code styling updates which have managed to pull through.

[wychoong]

Thanks @wychoong We'll take a look, however it seems like there's some code styling updates which have managed to pull through.

just pint.

for the order statuses ordering, depends on the lunar/core as payment-offline is not exist, i added that in PR lunarphp/lunar#863