eth_call requests for balances from the account tracker can occur even if the associated privacy setting is toggled off

[danjm]

The updateAccountsViaBalanceChecker method in the account tracker, and therefore the eth_call to the SINGLE_CALL_BALANCES_ADDRESSES, is happening even if the associated privacy setting ("Batch account balance requests") is toggled off.

This exists on 11.16.14, and probably earlier, although I have not yet determined how much earlier.

[Gudahtt]

Downgrading to sev3 because the balance update contract is still only being called with a single account at a time.

We can still update this to check the single account's balance directly, rather than through the contract. Maybe saving Infura some money and improving performance a little bit. But the problem shouldn't have any significant user impact or privacy impact.