buildextend-installer: Remove unnecessary kargs exclusions
I was looking at this to figure out why `console` was omitted,
and noticed we could trim some cruft here.  We no longer use
`root` or `rootflags` etc. since we reworked rootfs discovery
in
etc.
@@ -35,9 +35,6 @@ live_exclude_kargs = set([
'console', # no serial console by default on ISO
'ignition.platform.id', # we hardcode "metal"
'ostree', # dracut finds the tree automatically
- 'root', # we use root.squashfs
- 'rootflags', # not needed
- 'rw', # we have a read-only root
])
# Parse args and dispatch
