test: keep asset lock batch mempool sync

[thepastaclaw]

PR 7411 Review Follow-Up

Issue Being Fixed Or Feature Implemented

Follow-up for knst's review feedback on dashpay#7411:
dashpay#7411 (comment)

What Was Done

Reverted the asset-lock reorg padding change back to generate_batch(25) and
removed the now-unused generate_batch(sync_fun=...) plumbing.

How Has This Been Tested

• git diff --check
• python3 -m py_compile test/functional/feature_asset_locks.py

python3 test/functional/feature_asset_locks.py \
  --configfile=/Users/claw/Projects/dash/test/config.ini \
  --tmpdir=/private/tmp/dash_pr7411_knst_sync \
  --portseed=7411 \
  --timeout-factor=4

Breaking Changes

None.

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone

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[github-actions]

✅ No Merge Conflicts Detected

This PR currently has no conflicts with other open PRs.