Bug: account not exist after removing functionality register_if_not_exist

[mrLSD]

Description

With the latest PR merge #79 was discovered the bug related to account registration.

🔖 Test reproduced it: https://github.com/aurora-is-near/aurora-engine/actions/runs/9113376000/job/25054713709?pr=930#step:8:568

This particular test fails, as an account in deposit logic does not exist.

🖥️ Explanation

It was special logic with function register_if_not_exists, that controls account registration. It was removed to self.ft.storage_deposit and it broke the logic that a guaranty account exists.

[mrLSD]

I found where the issue is:

    ///  Mint `nETH` tokens
    fn mint_eth_on_near(&mut self, owner_id: &AccountId, amount: Balance) {
        log!("Mint {} nETH tokens for: {}", amount, owner_id);
        // Create account to avoid panic with deposit
        self.ft.internal_deposit(owner_id, amount);
    }

before changes in line with comment:

    // Create account to avoid panic with deposit

was created the account. Now it's removed. And in finish_deposit function account not created.

cc: @karim-en @olga24912