Remove verbose debugging statement

Summary:
This ends up in the system log otherwise. Reintroduction with categorized
logging might be useful.

Test Plan: No message in the log anymore.

Reviewers: Plasma, davidedmundson

Reviewed By: Plasma, davidedmundson

Subscribers: plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D13435