[BUG] Inconsistent adjusted order amount with inventory skew

[RC-13]

Describe the bug
Every time order refresh, the adjusted order amount in Eterbase exchange changes even if there are no filled trades.

Steps To Reproduce
Here are the steps to reproduce the issue (see attachments in the section below):

1. Create a pure market making strategy
2. Set exchange to Eterbase
3. Disable ping-pong
4. Disable order_refresh_tolerance_pct
5. Enable inventory skew, you can use the default skew value or set different inventory_target_base_pct.
6. Start strategy and wait for orders to refresh.
7. Check adjusted order amount value on the status window and logs and you will notice that it changes every time order gets refreshed.

Screenshots

Release version
0.29.0 and 0.30.0

Attachments
logs_Eterbase.log

WARNING: Do NOT publish any exchange API keys or your wallet's private key. Whoever has access to them may steal your assets!

Optional: your discord username:

[dennisocana]

This is caused by the broken balance update as mentioned here in https://github.com/CoinAlpha/hummingbot/issues/2012. Inventory skew uses the available balance instead of the total balance https://github.com/CoinAlpha/hummingbot/issues/1927. Changing issue title since this is not isolated to Eterbase connector. See screenshot below from Liquid.

[gabririgo]

+1 on bamboorelay

[gyozajiro]

#2224