About window now shows in quickbar

ubl-settings-datetime.glade

@@ -91,7 +91,6 @@
     <property name="window-position">center</property>
     <property name="icon-name">com.ublinux.ubl-settings-datetime</property>
     <property name="type-hint">dialog</property>
-    <property name="skip-taskbar-hint">True</property>
     <property name="urgency-hint">True</property>
     <property name="program-name">ubl-settings-datetime</property>
     <property name="version">1.0</property>