Fix updating user settings
Fix updating user settings

The requests dispatched from the personal settings page don't always
send all the possible params but just a subset. Hence requests currently
fail on master e.g. when you update your email. This makes the arguments
optional again.

Regression of da9462b482c77b71d6623be43a6aa1eda3d7cc06

Signed-off-by: Christoph Wurst <7abde52c298496fa169fb750f91f213a282142af@winzerhof-wurst.at>

nextcloud/server,nextcloud/server,nextcloud/server,nextcloud/server