Fix the "skipping 0 more comments" case

[Oaphi]

closes #2017

To reproduce the issue on develop:

1. Create a new comment thread on any post;
2. Add exactly 5 comments to the new thread (without navigating away);
3. Add a 6th comment to the thread;
4. Observe the "Skipping 0 more comments" widget showing up before the 6th comment;

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.76%. Comparing base (39d0527) to head (898fa6b).

Additional details and impacted files

Components	Coverage Δ
controllers	75.87% <ø> (-0.04%)	⬇️
helpers	85.09% <ø> (ø)
jobs	66.88% <ø> (ø)
models	93.01% <ø> (ø)
tasks	61.11% <ø> (ø)

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[cellio]

LGTM. No more "skipped 0 comments".