fix: honor payment tx id if present

[radkomih]

Description:

Honor SetPaymentTransactionID when generating query payments so an explicitly-set payment transaction ID is used instead of being silently replaced by a freshly generated one.

• Update Query.generatePayments to use the payment transaction ID set via SetPaymentTransactionID when present, falling back to auto-generation otherwise
• Re-enable the previously skipped TestUnitContractInfoQueryGetTransactionIDMock

Related issue(s):

Fixes #1782

Notes for reviewer:

The setter stored the ID in q.paymentTransactionIDs, but generatePayments always called TransactionIDGenerate(...) and never read it back, so the setter was a no-op across all query types. The fix reads the current ID from the slice when it is non-empty.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[lfdt-bot]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
sdk/query.go	86.38% <100.00%> (+0.29%)	⬆️

... and 1 file with indirect coverage changes

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[Dosik13]

lgtm!