fix (libzkp): check tx num when CCC ErrUnknown error occurred

[silathdiir]

1. Purpose or design rationale of this PR

Use CCC function get_tx_num to check tx count when CCC ErrUnknown error occurred.

2. PR title

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• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that doesn't fix a bug, or add a feature, or improves performance
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• test: Adding missing tests or correcting existing tests

3. Deployment tag versioning

Has the version in params/version.go been updated?

• This PR doesn't involve a new deployment, git tag, docker image tag, and it doesn't affect traces
• Yes

4. Breaking change label

Does this PR have the breaking-change label?

• This PR is not a breaking change
• Yes

[HAOYUatHZ]

I’ve refactored this PR @georgehao @silathdiir

1. so that we don’t need to worry about whether checkCurrentTxNumWithCCC will be correct in mock_ccc
2. I use

func (w *worker) checkCurrentTxNumWithCCC(expected int) {
	match, got, err := w.circuitCapacityChecker.CheckTxNum(expected) 

instead of

func (w *worker) checkCurrentTxNumWithCCC() {
	match, got, err := w.circuitCapacityChecker.CheckTxNum(w.current.tcount)

because not sure in the future whether we will need to check (ccc_tx == (w.current.tcount+1)), for example, in ccc successful cases.