postmarketos-ui-sway already depends on xorg-server-xwayland for
X clients. There is no need to pull in the entire X server including
all necessary drivers.
This saves ~84 MiB of disk space when installing postmarketos-ui-sway
on asus-me176c. X applications are still working fine through Xwayland.
Also remove explicit dependency on dbus - it is already pulled in
by dependencies like lightdm or elogind and nothing in
postmarketos-ui-sway depends on it specifically.
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