update test_network_status_fees to work on mainnet and testnet

[holtzman]

Motivation

python integration tests fails API v2 test_network_status_fees on mainnet because mainnet lacks FauxUSD token.

In this PR

• update test_network_status_fees to not require fees be set for FauxUSD

[codecov-commenter]

Codecov Report

Attention: 419 lines in your changes are missing coverage. Please review.

Comparison is base (ab2af32) 60.12% compared to head (c0fec72) 54.82%. Report is 178 commits behind head on main.

Files	Patch %	Lines
full-service/src/json_rpc/v2/api/wallet.rs	24.73%	103 Missing and 40 partials :warning:
full-service/src/json_rpc/v1/api/wallet.rs	37.50%	30 Missing and 15 partials :warning:
full-service/src/db/transaction_log.rs	70.92%	0 Missing and 41 partials :warning:
full-service/src/db/account.rs	81.08%	16 Missing and 12 partials :warning:
full-service/src/error.rs	0.00%	23 Missing :warning:
full-service/src/db/schema.rs	39.28%	1 Missing and 16 partials :warning:
full-service/src/db/wallet_db_error.rs	0.00%	17 Missing :warning:
full-service/src/config.rs	20.00%	15 Missing and 1 partial :warning:
full-service/src/db/wallet_db.rs	21.05%	15 Missing :warning:
full-service/src/db/models.rs	30.00%	11 Missing and 3 partials :warning:
... and 11 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #962 +/- ## ========================================== - Coverage 60.12% 54.82% -5.31% ========================================== Files 88 124 +36 Lines 12356 15840 +3484 Branches 2010 2742 +732 ========================================== + Hits 7429 8684 +1255 - Misses 3238 5126 +1888 - Partials 1689 2030 +341 ```

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