kdeplasma-addons: save the kolourpicker format changes instantly

it may not be exactly instantly (config changes are saved on timer)
but as soon as the default color format changes

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>

kdeplasma-addons/applets/kolourpicker/kolourpicker.cpp

@@ -278,6 +278,8 @@ void Kolourpicker::setDefaultColorFormat(QAction *act)
     }
 
     m_color_format = qvariant_cast<QString>(act->data());
+    KConfigGroup cg = config();
+    saveData(cg);
 }
 
 Kolourpicker::~Kolourpicker()