[vim/vim] terminal: mouse stays enabled after Vim is killed with SIGTERM (PR #21095)

```
Problem:  After Vim is killed with a deadly signal such as SIGTERM the mouse
          stays enabled in the terminal, so moving the mouse afterwards
          produces escape sequences in the shell.
Solution: Switch the mouse off when exiting after a deadly signal.  The
          terminal mode is restored with "full_screen" already reset, which
          makes settmode() return before it can do this.
```

fixes: #21090

`deathtrap()` resets `full_screen` before calling `preserve_exit()`
(os_unix.c:1193), and `settmode()` returns early when it is not set
(term.c:3987).  The `mch_setmouse(FALSE)` that lives inside `settmode()` is
therefore never reached.  `stoptermcap()` does not look at `full_screen`,
which is why the alternate screen, bracketed paste and focus reporting are
restored and only the mouse is left enabled.

The added call is guarded by `!full_screen`.  The other callers of
`preserve_exit()`, `read_error_exit()` and the MS-Windows console control
handler, leave `full_screen` set, and there `settmode()` still switches the
mouse off after reading pending terminal responses, as before.

Recorded with `script` while sending SIGTERM from another process.  Before:

    ^[[?1002h        <- no matching l
    ^[[?1006;1000h   <- no matching l
    ^[[?1049h / ^[[?1049l
    ^[[?1004h / ^[[?1004l

After the change every mode is paired again.

No test: reproducing this needs a pty plus a signal, which is hard to keep
reliable in the test suite.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21095

-- Commit Summary --

  * terminal: mouse stays enabled after Vim is killed with SIGTERM

-- File Changes --

    M src/misc1.c (5)

-- Patch Links --

https://github.com/vim/vim/pull/21095.patch
https://github.com/vim/vim/pull/21095.diff

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