ews: extract settings also from type EXPR
It seems that Microsoft has changed the EWS autodiscover response for
Office 365. In my test account the type EXCH now only contains the OAB
URL, whereas the type EXPR now contains the same OAB URL and the other
three URLs. So SIPE ends up with no EWS URL and therefore can't extract
the UCS buddy list :-(
Update the response parser to loop over all types and use for each URL
the first found value from EXCH or EXPR.
(cherry picked from commit
92ecf88ebdb165ffb84f6aef8a6c6d347c9314b1)