wallet: add no_initial_sync argument to open_wallet rpc command.

[0xFFFC0000]

Add refresh step when opening a wallet with open_wallet.

1. add no_initial_sync argument to open_wallet rpc command.
2. Clean --no-initial-sync implementation.
3. Fix spelling error.

The interface for open_wallet has stayed the same. Passing no_initial_sync to open_wallet RPC will prevent open_wallet from doing a refresh after opening a wallet.

Open wallet with default refresh:

open_wallet': curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"open_wallet","params":{"filename":"WalletName","password":""}}' -H 'Content-Type: application/json'

Open wallet without refresh after opening wallet:

open_wallet': curl http://localhost:18082/json_rpc -d '{"jsonrpc":"2.0","id":"0","method":"open_wallet","params":{"filename":"MainNetWallet","password":"", "no_initial_sync": true}}' -H 'Content-Type: application/json'