Move subiquity systemd service to includes.binary; so that it's copied only on the installer overlay.

live-build/ubuntu-server-next/includes.binary/boot/overlay.dir/lib/systemd/system/multi-user.target.wants/subiquity.service

@@ -0,0 +1 @@
+../subiquity.service

live-build/ubuntu-server-next/includes.chroot/lib/systemd/system/subiquity.service

@@ -1,31 +0,0 @@
-[Unit]
-Description=Subiquity, the installer for Ubuntu Server
-After=systemd-user-sessions.service plymouth-quit-wait.service
-After=rc-local.service
-Requires=snapd.service
-IgnoreOnIsolate=yes
-ConditionPathExists=/dev/tty0
-ConditionPathExists=!/run/subiquity/complete
-
-[Service]
-Environment=PYTHONPATH=/usr/share/subiquity
-ExecStartPre=/bin/systemctl stop getty@tty1
-ExecStart=/sbin/agetty -n --noclear -l /snap/bin/subiquity tty1 $TERM
-ExecStopPost=/bin/systemctl start getty@tty1
-Type=idle
-Restart=always
-RestartSec=0
-UtmpIdentifier=tty1
-TTYPath=/dev/tty1
-TTYReset=yes
-TTYVHangup=yes
-TTYVTDisallocate=yes
-KillMode=process
-IgnoreSIGPIPE=no
-SendSIGHUP=yes
-
-#KillMode=process
-#Restart=always
-#StandardInput=tty-force
-#StandardOutput=tty
-#StandardError=tty