helix: Further cleanups to helix paste in line mode (#38694)

I noticed that after we paste in line mode, the cursor position is
positioned at the beginning of the next logical line which is somewhat
undesirable since then inserting/appending will position the cursor
after the selection. This does not match helix behaviour which we should
further investigate.

Follow-up to https://github.com/zed-industries/zed/pull/38663

Release Notes:

- N/A
f07bc12aedJakub Konka committed on 9/23/2025, 7:44:50 AM· committed by GitHubparent4532765
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