[kcmkwin/decorations] Use correct header text

Summary: The header text is supposed to be the KCM's name, not a duplicate of the tooltip text.

Test Plan: {F6615111, size=full}

Reviewers: #vdg, GB_2

Reviewed By: #vdg, GB_2

Subscribers: kwin

Tags: #kwin

Maniphest Tasks: T10273

Differential Revision: https://phabricator.kde.org/D19018

kcmkwin/kwindecoration/kcm.cpp

@@ -87,7 +87,7 @@ KCMKWinDecoration::KCMKWinDecoration(QObject *parent, const QVariantList &argume
     , m_currentSettings(m_savedSettings)
 {
     auto about = new KAboutData(QStringLiteral("kcm_kwindecoration"),
-                                i18n("Configure window titlebars and borders"),
+                                i18n("Window Decorations"),
                                 QStringLiteral("1.0"),
                                 QString(),
                                 KAboutLicense::GPL);