Disable "reset your password" option for delegated LDAP

In Stash 3.10.2, following the "Unable to access your account?" link from the Stash login page, the behaviour is different for a delegated vs synced LDAP directory.

For a synced LDAP, entering an LDAP username on the /passwordreset page gets a (correct) error that "Your account details are read-only. Please contact your administrator to change your password."

However, this doesn't occur for a delegated LDAP user - instead, the password reset email is sent, but when following the link and choosing a new password the page just gives a generic 'Could not update password for bradley.baetz' error. This leads to user confusion.

The same behaviour should occur for both types of LDAP user directories.