Fix timezone pre-select bug.
Fix timezone pre-select bug.

Use getTimezoneOffset to get offset in minutes, then build string like '(GMT -8:00)', then search by using id contains.
Finally set the radio we find as checked.

But it seems like the timezone value is not really saved finally, so it will be better to make another bug for it.

OpenBazaar/OpenBazaar-Client,blockchainProject/blockchain-project-client,mariodian/OpenBazaar-Client,mariodian/OpenBazaar-Client,programmerpeter/OpenBazaar-Client,rmisio/OpenBazaar-Client,Kirvx/OpenBazaar-Client,rmisio/OpenBazaar-Client,jjeffryes/OpenBazaar-Client,programmerpeter/OpenBazaar-Client,OpenBazaar/OpenBazaar-Client,blockchainProject/blockchain-project-client,Kirvx/OpenBazaar-Client,jjeffryes/OpenBazaar-Client