tdf#91554 OK button should be disabled initially

Regression of eb505c25.

Change-Id: I4623c41617d92a808513f18154a7531e6dfd5463
(cherry picked from commit fdbad676)
Reviewed-on: https://gerrit.libreoffice.org/18370Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Adolfo Jayme Barrientos <fitojb@ubuntu.com>

sfx2/uiconfig/ui/newstyle.ui

@@ -23,6 +23,7 @@
               <object class="GtkButton" id="ok">
                 <property name="label">gtk-ok</property>
                 <property name="visible">True</property>
+                <property name="sensitive">False</property>
                 <property name="can_focus">True</property>
                 <property name="can_default">True</property>
                 <property name="has_default">True</property>