[Bookmarks Runner] Remove unused database parameter from query
Summary:
The query is no longer initialized for each query, just once, thus there
no longer is a need for the database parameter.
Test Plan: make
Reviewers: Frameworks, davidedmundson
Reviewed By: davidedmundson
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D15490