[vim/vim] scroll: unreachable 'smoothscroll' code in cursor_correct() (PR #20891)

```
Problem:  cursor_correct() checks for 'smoothscroll' with 'wrap' off, a
          combination where 'smoothscroll' has no effect.
Solution: Remove the check, adjust_skipcol() already handles the case where
          the cursor line just fits in the window.
```

---

Found while auditing the places that reset w_skipcol.  The check requires
'wrap' to be off, where 'smoothscroll' has no effect, so it never runs.
Removing it does not change behaviour: 20 cases of 'smoothscroll' with
'nowrap' in a one line window give identical results before and after.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20891

-- Commit Summary --

  * scroll: unreachable 'smoothscroll' code in cursor_correct()

-- File Changes --

    M src/move.c (13)

-- Patch Links --

https://github.com/vim/vim/pull/20891.patch
https://github.com/vim/vim/pull/20891.diff

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