user-manager build failure

[Jonathan Riddell]

the change to fix a memory leak from
 https://phabricator.kde.org/D2215
which was commited as e9c7e86d47b6ef04ea9fbe4efadb825c55b297e2 by
David E has caused a build failure
 http://build.neon.kde.org/job/xenial_stable_plasma_user-manager_bin_amd64/14/console

src/lib/accountmodel.cpp:58:47: error: no matching function for call
to ‘KEMailSettings::KEMailSettings(AccountModel*)’

which is confirmed by my reading of the API docs

https://api.kde.org/frameworks/kconfig/html/classKEMailSettings.html

It and previous commit eff5c5baf659e40f6a5a34275e5d801f54db48ff
haven't been merged into master

Jonathan