Fix fake parser copy and paste error

Summary:
all other cases remove the key they were looking for, this seems to
be a copy and paste error.

Test Plan: tests are not affected.

Reviewers: broulik, davidedmundson

Reviewed By: broulik, davidedmundson

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D14048