Abort updateWindowTitle and activeViewChanged if not changed.

Summary:

• Prevent activeViewChanged from updating the window if the view is the same view (happens at least once when starting up)
• Stop updateWindowTitle from updating the title if its not changed.

Reviewers: Dolphin, elvisangelaccio, broulik

Reviewed By: Dolphin, elvisangelaccio, broulik

Subscribers: anthonyfieroni, broulik, kfm-devel

Tags: Dolphin

Differential Revision: https://phabricator.kde.org/D17882