KCM LookAndFeel : Remove unused Q_PROPERTIES, getter const, internal method private, typo in enum declaration
Summary: Clean up before moving LnF KCM to KConfigXT
Test Plan: Compile
Reviewers: Plasma, ervin, mart, bport
Subscribers: plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D24819