[vim/vim] tests: hardcopy tests wait for the print dialog in the GTK4 GUI (PR #21011)

```
Problem:  Three :hardcopy tests open the print dialog and wait for input
          when the tests run in the GTK4 GUI.  There 'printexpr' is never
          used, so Test_printexpr does not test anything.
Solution: Add the bang to skip the dialog, as documented in print.txt.
```

related: #21007
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21011

-- Commit Summary --

  * tests: hardcopy tests wait for the print dialog in the GTK4 GUI

-- File Changes --

    M src/testdir/test_hardcopy.vim (6)

-- Patch Links --

https://github.com/vim/vim/pull/21011.patch
https://github.com/vim/vim/pull/21011.diff

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