[System Tray] Fix regression on SNI fallback

As mentioned in https://bugs.kde.org/show_bug.cgi?id=365308
because of 27b10307 we regressed on 5d551845.

This patch fixes it again.

Reviewers: #plasma, broulik, davidedmundson, mart

Reviewed By: mart

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D5270