Fix connection to invalid signal

Summary: Don't do an = when we have a binding that does the same thing

Test Plan: I have NOT tested this actually works better than it did with the broken connect, only that it removes the wrong connect

Reviewers: davidedmundson

Reviewed By: davidedmundson

Subscribers: plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D27686