Summary:
1d10226d and 83549151 introduced those lines to follow gnome-control-center example.
Since then gnome-control-center does not call AccountService CacheUser UnCacheUser.

BUG: 392943
FIXED-IN: 5.18

Test Plan:
1. Open user-mananger `kcmshell5 user_manager`
2. Ensure to set any picture for your user
3. Add "1" to your Real name
4. Click on Apply

Before:
The avatar for your account in the left list is resetted to default setting.

After:
Only the RealName has changed.

Reviewers: ngraham, #plasma

Reviewed By: ngraham

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D25439