separe mobile text selection to avoid recursive imports
Summary:
the mobile text selection toolbar uses toolbuttons, which in turn use the
private import. This will make the components loading stuck in dependency
resolution
Test Plan: all loads correctly now
Reviewers: Plasma, hein
Reviewed By: Plasma, hein
Subscribers: hein, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D20428