fix: reduce kde image size #382

Job	Run time
live-iso (x86_64, flagship/flagship-live)	21m 49s
image (x86_64, base/base-disk)	18m 41s
live-iso (x86_64, gnome/gnome-live)	2m 23s
live-iso (x86_64, kde/kde-live)	23m 8s
image (x86_64, flagship/base-disk)	33m 6s
image (x86_64, gnome/base-disk)	1m 52s
live-iso (x86_64, xfce/xfce-live)	21m 23s
image (x86_64, kde/base-disk)	33m 24s
live-iso (aarch64, flagship/flagship-live)	59m 51s
image (x86_64, xfce/base-disk)	30m 43s
live-iso (aarch64, gnome/gnome-live)	3m 54s
image (aarch64, base/base-disk)	44m 43s
live-iso (aarch64, kde/kde-live)	54m 31s
image (aarch64, flagship/base-disk)	1h 28m 58s
image (aarch64, gnome/base-disk)	4m 54s
live-iso (aarch64, xfce/xfce-live)	45m 44s
image (aarch64, kde/base-disk)	1h 33m 53s
image (aarch64, xfce/base-disk)	1h 21m 39s
push-image	0s
	11h 4m 36s

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