Rename methods on DolphinFacetsWidget
Summary:
Small refactor patch to rename method names, from ratingTerm to searchTerm,
since its scope has grown bigger.
Test Plan: No behavior changes
Reviewers: Dolphin, elvisangelaccio
Reviewed By: Dolphin, elvisangelaccio
Subscribers: kfm-devel
Tags: Dolphin
Differential Revision: https://phabricator.kde.org/D26029