[vim/vim] popup: opacity popup over a terminal is not cleared when closed (PR #20848)

This PR fixes: #20846 .

```
Problem:  A semi-transparent (opacity) popup shown over a terminal window
          leaves its old cells on screen when it is closed.
Solution: When a semi-transparent popup is closed, trigger full redraw
          of underlying terminal windows.
```
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20848

-- Commit Summary --

  * popup: opacity popup over a terminal is not cleared when closed

-- File Changes --

    M src/popupwin.c (11)
    A src/testdir/dumps/Test_popupwin_opacity_term_close_1.dump (12)
    A src/testdir/dumps/Test_popupwin_opacity_term_close_2.dump (12)
    M src/testdir/test_popupwin.vim (44)

-- Patch Links --

https://github.com/vim/vim/pull/20848.patch
https://github.com/vim/vim/pull/20848.diff

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