Fix group popup dialog

Summary:
Fixes regression introduced with ab26ebb18b74: That diff contained
a change unrelated to the original submission, swapping a || out for
&& in response to a review note. This turns out to have broken things.

BUG:401508

Reviewers: davidedmundson

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D17219