refactor: increase ban tolerance for unexpected responses

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.96970% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.83%. Comparing base (0379fe2) to head (6736d0d).

Files	Patch %	Lines
src/subcmds.rs	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #196 +/- ## =========================================== + Coverage 71.73% 71.83% +0.09% =========================================== Files 25 25 Lines 6708 6735 +27 =========================================== + Hits 4812 4838 +26 - Misses 1896 1897 +1 ``` | [Flag](https://app.codecov.io/gh/nervosnetwork/ckb-light-client/pull/196/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/nervosnetwork/ckb-light-client/pull/196/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork) | `71.83% <96.96%> (+0.09%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=nervosnetwork#carryforward-flags-in-the-pull-request-comment) to find out more.

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