fix(approval-flow): do not skip the polling interval

[lowie27]

Fixes #235

The continue in the pending branch bypassed time.Sleep, so with close-issue-means-denial set
the loop sent 12 API calls per polling-interval-seconds instead of 1.

Measured against an httptest stub with the real newCommentLoopChannel, 1 second interval over
5.5 seconds:

before   72 API calls   13.1 per interval
after     6 API calls    1.1 per interval

make test and make lint pass locally (golangci-lint v2.10.1, 0 issues).

The measurement is a Go test I can add in a follow-up if you want it; left out here to keep this to
one line.

[snskArora]

Note

Today the eleven-iteration burst completes in roughly one interval, so a closed issue is noticed within ~10s at defaults
After this fix, Issues.Get fires once every 11 intervals; ~110s at defaults, and ~11 minutes for anyone running polling-interval-seconds as 60.