fix: remove lightdm gtk tweak scripts #475

Job	Run time
tar (x86_64, wsl/wsl)	1m 40s
live-iso (x86_64, flagship/flagship-live)	27m 40s
tar (aarch64, wsl/wsl)	5m 39s
live-iso (x86_64, gnome/gnome-live)	26m 47s
image (x86_64, base/base-disk)	5m 57s
live-iso (x86_64, plasma/plasma-live)	30m 10s
image (x86_64, flagship/base-disk)	8m 7s
live-iso (x86_64, xfce/xfce-live)	28m 27s
image (x86_64, gnome/base-disk)	8m 12s
live-iso (aarch64, flagship/flagship-live)	1h 26m 23s
image (x86_64, plasma/base-disk)	8m 23s
live-iso (aarch64, gnome/gnome-live)	1h 29m 11s
image (x86_64, xfce/base-disk)	8m 2s
live-iso (aarch64, plasma/plasma-live)	1h 50m 39s
image (aarch64, base/base-disk)	17m 26s
image (aarch64, flagship/base-disk)	19m 40s
live-iso (aarch64, xfce/xfce-live)	1h 47m 9s
image (aarch64, gnome/base-disk)	22m 36s
image (aarch64, plasma/base-disk)	8m 35s
image (aarch64, xfce/base-disk)	7m 4s
push-image	0s
	10h 27m 47s

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