Reparse the input configuration when we are notified that it changed

Otherwise we'd process again the kconfig information in memory and
discard it because it's the same as last time.

cursor.cpp

@@ -109,6 +109,7 @@ void Cursor::slotKGlobalSettingsNotifyChange(int type, int arg)
 {
     Q_UNUSED(arg)
     if (type == 5 /*CursorChanged*/) {
+        kwinApp()->inputConfig()->reparseConfiguration();
         loadThemeFromKConfig();
         // sync to environment
         qputenv("XCURSOR_THEME", m_themeName.toUtf8());