Port kcm input to UI File.
Summary: A split version of D8168. This only refactors the hardcoded ui constructor into an equilvalent UI file. This change has no string change nor behavior change. Test Plan: Test config opton manually. Reviewers: subdiff, davidedmundson, ngraham Reviewed By: subdiff Subscribers: plasma-devel Tags: #plasma Differential Revision: https://phabricator.kde.org/D8456
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