fix uneditable field in memory option page

this will fix an uneditable "remove from memory after" field

Change-Id: I0b47c4b8082d3244186596a7127f059bbb7214a5
Reviewed-on: https://gerrit.libreoffice.org/5640Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

cui/uiconfig/ui/optmemorypage.ui

@@ -22,11 +22,6 @@
     <property name="step_increment">1</property>
     <property name="page_increment">10</property>
   </object>
-  <object class="GtkAdjustment" id="adjustment4">
-    <property name="lower">10000</property>
-    <property name="upper">23590000</property>
-    <property name="value">100000</property>
-  </object>
   <object class="GtkBox" id="OptMemoryPage">
     <property name="visible">True</property>
     <property name="can_focus">False</property>
@@ -229,7 +224,6 @@
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="invisible_char">•</property>
-                    <property name="adjustment">adjustment4</property>
                   </object>
                   <packing>
                     <property name="left_attach">1</property>