Change "BitcoinBeachMarketing" account name to "@BTCBeachWallet"

[agbegin]

Currently when a user receives sats from the earn quiz, payments come from "BitcoinBeachMarketing" which is too long and not a user-centric name.

The account name should be changed to @BTCBeachWallet which will fit on one line and will reinforce the social media handle.

[nicolasburtey]

is it still the case?