fix: Add missing semicolon

[tobiasbaehr]

The missing semicolon results into a broken value as origin pattern. Therefore updates was not applied.

Compare it with apt-config dump or run a dry-run where security updates are pending.

apt-config dump:

Unattended-Upgrade::Origins-Pattern "";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename},label=Debian-Security";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename}-security,label=Debian-Security";
Unattended-Upgrade::Origins-Pattern::origin%3dUbuntu,archive%3d${distro_codename}-security "origin=${distro_id}ESMApps,archive=${distro_codename}-apps-security";
Unattended-Upgrade::Origins-Pattern:: "origin=${distro_id}ESM,archive=${distro_codename}-infra-security";

vs.

Unattended-Upgrade::Origins-Pattern "";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename},label=Debian-Security";
Unattended-Upgrade::Origins-Pattern:: "origin=Debian,codename=${distro_codename}-security,label=Debian-Security";
Unattended-Upgrade::Origins-Pattern:: "origin=${distro_id},archive=${distro_codename}";
Unattended-Upgrade::Origins-Pattern:: "origin=Ubuntu,archive=${distro_codename}-security";
Unattended-Upgrade::Origins-Pattern:: "origin=${distro_id}ESMApps,archive=${distro_codename}-apps-security";