#5165 fix/user balance failure for time synchronizer

Change in the logic that gets the user balance for Binance and Binance Perpetual. Since the exchange requires the time to be synchronized before any interaction, with this PR we add logic to the _update_balances() function to ensure the TimeSynchronizer has been initialized before requesting the balance.

Link: https://github.com/hummingbot/hummingbot/pull/5165