Set can_focus true for Area tab page Bitmap listbox

can_focus property needs to be true for tab navigation to stop here

Change-Id: If9ed0cefc652369243d623a311ba92e2941bd43f
Reviewed-on: https://gerrit.libreoffice.org/57834
Tested-by: Jenkins
Reviewed-by: Katarina Behrens <Katarina.Behrens@cib.de>

cui/uiconfig/ui/bitmaptabpage.ui

@@ -31,7 +31,7 @@
                 <child>
                   <object class="svxcorelo-SvxPresetListBox" id="BITMAP">
                     <property name="visible">True</property>
-                    <property name="can_focus">False</property>
+                    <property name="can_focus">True</property>
                     <property name="hexpand">True</property>
                     <property name="vexpand">True</property>
                   </object>