[Bug]: Fix password display for Quicksy and Quick Account Creation

[tmolitor-stud-tu]

We need to fix displaying the cleartext password on Quicksy and when using the new quick account creation in regular Monal builds.

[lissine0]

This works correctly on Quicksy.
Reminder that I made it show the password in clear text only if the password is autogenerated i.e. it wasn't changed by the user. (See #1183 (comment), f7ea67ad6c8 and 4b942016b40)

Note that the assumption was that only Quicksy would have autogenerated passwords, thus the defaultsDB was used. (since you can't have multiple accounts on Quicksy)

However, using the defaultsDB for one-click-registration will lead to situations like this:
If you add an account with one-click-registration, and then add another account normally, both will have their passwords in clear text. And if you change one of the passwords, both will no longer be visible in clear text.

[tmolitor-stud-tu]

Yeah I know, we now need a per-account setting, preferably in the account db table.