[vim/vim] GTK4: 'lines' and 'columns' are not limited to the screen size (Issue #21041)

h-east created an issue (vim/vim#21041)

### Steps to reproduce

$ vim --clean -g +"set ls=2"
:set lines=999

--> At the very least, the status line and command line are off-screen.
 

### Expected behaviour

'lines' and 'columns' are reduced so that the window still fits on the screen.

On my screen 38 lines and 182 columns fit, but Vim ends up with 46 lines and
190 columns, and the window is larger than the screen.

The GTK3 GUI limits the window to the screen size as expected.

### Version of Vim

9.2.0954

### Environment

Ubuntu 24.04

Vim's configure
```
./configure --with-wayland --enable-gui=gtk4 --enable-python3interp --enable-canberra --enable-fail-if-missing
```

### Logs and stack traces

```shell

```

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