[kcms/icons] Fix i18n usage

The code uses I18N_NOOP but doesn't actually call i18n later as needed.

However we don't really need the I18N_NOOP and can use the regular i18n

Fixes https://invent.kde.org/plasma/systemsettings/-/issues/11

kcms/icons/iconsizecategorymodel.cpp

@@ -11,11 +11,11 @@
 IconSizeCategoryModel::IconSizeCategoryModel(QObject *parent)
     : QAbstractListModel(parent)
     , m_data({
-          {QStringLiteral("toolbarSize"), I18N_NOOP("Toolbar"), QStringLiteral("Toolbar"), KIconLoader::Toolbar},
+          {QStringLiteral("toolbarSize"), i18n("Toolbar"), QStringLiteral("Toolbar"), KIconLoader::Toolbar},
-          {QStringLiteral("mainToolbarSize"), I18N_NOOP("Main Toolbar"), QStringLiteral("MainToolbar"), KIconLoader::MainToolbar},
+          {QStringLiteral("mainToolbarSize"), i18n("Main Toolbar"), QStringLiteral("MainToolbar"), KIconLoader::MainToolbar},
-          {QStringLiteral("smallSize"), I18N_NOOP("Small Icons"), QStringLiteral("Small"), KIconLoader::Small},
+          {QStringLiteral("smallSize"), i18n("Small Icons"), QStringLiteral("Small"), KIconLoader::Small},
-          {QStringLiteral("panelSize"), I18N_NOOP("Panel"), QStringLiteral("Panel"), KIconLoader::Panel},
+          {QStringLiteral("panelSize"), i18n("Panel"), QStringLiteral("Panel"), KIconLoader::Panel},
-          {QStringLiteral("dialogSize"), I18N_NOOP("Dialogs"), QStringLiteral("Dialog"), KIconLoader::Dialog},
+          {QStringLiteral("dialogSize"), i18n("Dialogs"), QStringLiteral("Dialog"), KIconLoader::Dialog},
       })
 {
 }