Add calendar in allowlist so that background sync can be done properly

    <allow-in-power-save package="com.google.android.gms" />

    <allow-in-power-save package="foundation.e.accountmanager" />

    <allow-in-power-save package="foundation.e.mail" />

    <allow-in-power-save package="foundation.e.calendar" />

    <!-- The PAC proxy process must have network access, otherwise no app will

         be able to connect to the internet when such a proxy is in use, since