kf6-breeze-icons generate identical icons for both breeze & breeze-dark. While
this is not an issue for KF6 apps, that use run-time recoloring, in KF5 apps,
like Krusader, when dark color theme is used and icons are breeze-dark symbolic
icons are dark on dark background and almost invisible.

The reason is this build option: `-DWITH_ICON_GENERATION:BOOL=FALSE`

I've tried to make my custom build [1] switching it to TRUE and breeze-dark
icons are fine with Krusader now. But I don't know the reasoning behind
switching it to FALSE. There is comment:
```
saves ~30MB and installs dangling symlinks
```

Less size is true, though IMHO it's not a good solution to break KF5 apps to
save some space.
But I can't see any dangling symlinks:
```
find /usr/share/icons/breeze{,-dark} -xtype l
```
doesn't find anything.

Any other reason or should I cleanup [1] and make a submit request?

[1]
https://build.opensuse.org/package/show/home:NickLion:branches:KDE:Frameworks/kf6-breeze-icons