Fixed encryption entry visibility for advanced installation page

ubinstall-gtk-advanced-box.glade

@@ -338,6 +338,8 @@
                             <property name="visible">True</property>
                             <property name="sensitive">False</property>
                             <property name="can-focus">True</property>
+                            <property name="visibility">False</property>
+                            <property name="invisible-char">*</property>
                           </object>
                           <packing>
                             <property name="expand">False</property>