[FIX] auth_password_policy: remove deferred when not needed

When auth_password_policy is installed, and a field with
`password="True"` is in a res.config.settings (eg. google calendar is
installed) we could have an error caused by deferred not expected in the
res.config.settings _render.

Since the RPC is only needed when the password_policy has been been
defined, this commit do this removing the error that currently happened.

A customization of res.config.settings adding password_meter would still
break settings (but it is currently not done) and will be solved in a
future fix.
closes #27426

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