Remove delegation and implicit accounts amounts from available balance

[Thoralf-M]

Description of change

Remove delegation and implicit accounts amounts from available balance

Links to any relevant issues

Fixes #2170

Type of change

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

With the cli wallet, balance before output with implicit account creation address:

    base_coin: BaseCoinBalance {
        total: 2000000000,
        available: 1999968300,

After an output with implicit account creation address got added

    base_coin: BaseCoinBalance {
        total: 3000000000,
        available: 1999968300,