Explicitly depend on kdialog for cachyos-calamares-qt6-next-limine

[5long]

Assuming we're moving forward with CachyOS/CachyOS-Live-ISO#73, new Live ISO will replace yad with kdialog. Also quoting @ventureoo :

https://github.com/CachyOS/cachyos-calamares/blob/cachyos-refind-qt6-dev/src/modules/bootloader/main.py

No, it's not. This dialog is specific only for Limine branch. I will rewrite it using kdialog as soon as this PR will be merged.

This will make new calamares depend on kdialog as well. I think I need to come up with a plan to make sure users' old ISOs won't break.

• Old ISO, new calamares

Given that the initial install script upgrades calamares after picking a bootloader, new calamares will be running on old ISO (e.g. 251129) where there is no kdialog. This PR fixes this situation by installing kdialog as a dependency of calamares.

• New ISO, old calamares

Occasionally, testing ISO is being downloaded in Discord for early testing. Old calamares packages will break on them for the lack of yad.

This can be mitigated by merging this PR & building new calamares packages before CachyOS/CachyOS-Live-ISO#73 gets merged, preventing this situation completely.

Ideally there should be a time window of at least 1 day to wait for all the mirrors to catch up syncing.

[5long]

With #73 closed this patch is no longer needed.