shutdown: fix owner on cloud-init logs

These have owner syslog at install time, but that is uid remapped on the
target system which may end up with a different owning user.

subiquity/server/controllers/shutdown.py

@@ -92,6 +92,7 @@ async def copy_cloud_init_logs(self, target_logs):
         for logfile in cloudinit_logs:
             if not os.path.exists(logfile):
                 continue
+            set_log_perms(logfile)
             await self.app.command_runner.run(
                 ["cp", "-a", logfile, "/var/log/installer"]
             )