Prompt user when KWallet is disabled
Summary: From now, when the user saves the password by clicking remember he will get a notification that the password is saved.
Reviewers: SGOrava, drosca
Reviewed By: SGOrava, drosca
Subscribers: drosca, alukichev, falkon
Tags: Falkon
Differential Revision: https://phabricator.kde.org/D26932