Fixed specific window icon

ubl-settings-repomanager.glade

@@ -283,7 +283,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
     <property name="can-focus">False</property>
     <property name="resizable">False</property>
     <property name="default-width">450</property>
-    <property name="icon-name">dialog-question-symbolic</property>
+    <property name="icon-name">com.ublinux.ubl-settings-repomanager</property>
     <child>
       <object class="GtkBox">
         <property name="visible">True</property>