[Users] Save password store when OAuth tokens are refreshed

[Gianni Ceccarelli]

Hello!

I've noticed that, when `oauth2_check_passwds` is called, the
in-memory passwords/tokens are updated, but not the on-disk
`passwordstorerc`.

This is not much of a problem for most people, but I have code (
https://www.thenautilus.net/cgit/config-clawsmail/tree/ ) that parses
the password store so some scripts of mine can send email using the
accounts configured in claws, and they don't work when the tokens have
been refreshed, because the values on disk are now wrong.

I think the attached patch would solve my problem. Would you consider
merging it?

Thanks in advance.

-- 
	Dakkar - <Mobilis in mobile>
	GPG public key fingerprint = A071 E618 DD2C 5901 9574
	                             6FE2 40EA 9883 7519 3F88
	                    key id = 0x75193F88

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