Changed about dialog icon

ubl-settings-bootloader.glade

@@ -14,7 +14,7 @@
     <property name="resizable">False</property>
     <property name="modal">True</property>
     <property name="window-position">center</property>
-    <property name="icon-name">com.ublinux.ubl-settings-diskquota</property>
+    <property name="icon-name">com.ublinux.ubl-settings-bootloader</property>
     <property name="type-hint">dialog</property>
     <property name="urgency-hint">True</property>
     <property name="program-name">ubl-settings-bootloader</property>