[vim/vim] fold size is compared against 'foldminlines' of the wrong window (PR #20864)

### Problem
checkSmall() compares the fold size of window `wp` against the current window's `foldminlines`.  A fold of another window, e.g. measured while it is redrawn, is judged by an unrelated option value.

### Solution:
Use `foldminlines` of the window containing the fold
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20864

-- Commit Summary --

  * fold size is compared against 'foldminlines' of the wrong window

-- File Changes --

    M src/fold.c (4)
    M src/testdir/test_fold.vim (38)

-- Patch Links --

https://github.com/vim/vim/pull/20864.patch
https://github.com/vim/vim/pull/20864.diff

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