Install kcm_breezedecoration in separate namespace

This way we do not unnecessarily load it by systemsettings.

kdecoration/config/CMakeLists.txt

@@ -1,4 +1,4 @@
-kcoreaddons_add_plugin(kcm_breezedecoration SOURCES kcm_breezedecoration.cpp INSTALL_NAMESPACE "plasma/kcms/systemsettings_qwidgets")
+kcoreaddons_add_plugin(kcm_breezedecoration SOURCES kcm_breezedecoration.cpp INSTALL_NAMESPACE "plasma/kcms/breeze")
 target_include_directories(kcm_breezedecoration PRIVATE ${CMAKE_SOURCE_DIR}/kdecoration ${CMAKE_BINARY_DIR}/kdecoration/)
 target_link_libraries(kcm_breezedecoration breezecommon5 breezedecoration_STATIC KF5::I18n KF5::CoreAddons KF5::ConfigWidgets Qt::DBus)
 kcmutils_generate_desktop_file(kcm_breezedecoration)

kstyle/config/main.cpp

@@ -28,7 +28,7 @@ int main(int argc, char *argv[])
     KCMultiDialog dialog;
     dialog.setWindowTitle(i18n("Breeze Settings"));
     dialog.addModule(KPluginMetaData(QStringLiteral("plasma/kcms/systemsettings_qwidgets/breezestyleconfig")));
-    dialog.addModule(KPluginMetaData(QStringLiteral("plasma/kcms/systemsettings_qwidgets/kcm_breezedecoration")));
+    dialog.addModule(KPluginMetaData(QStringLiteral("plasma/kcms/breeze/kcm_breezedecoration")));
     dialog.show();
 
     foreach (auto child, dialog.findChildren<QAbstractScrollArea *>()) {