mkosi: RuntimeScratch=/--runtime-scratch= are deprecated

See 054d0690b0

mkosi/mkosi.conf

@@ -147,7 +147,6 @@ Credentials=
         tty.virtual.tty1.agetty.autologin=root
         tty.virtual.tty1.login.noauth=yes
 RuntimeBuildSources=yes
-RuntimeScratch=no
 CPUs=2
 TPM=yes
 VSock=yes

test/integration-tests/integration-test-wrapper.py

@@ -584,7 +584,6 @@ def main() -> None:
         ),
         '--credential', f'systemd.unit-dropin.{args.unit}={shlex.quote(dropin)}',
         '--runtime-network=none',
-        '--runtime-scratch=no',
         *([f'--qemu-args=-rtc base={rtc}'] if rtc else []),
         *args.mkosi_args,
         '--firmware', firmware,