tdf#119299 Start with a never scrollbar policy

Similar to 8161d9cf
("Fix initial width of the color palette in welded picker")

Change-Id: I9d9584c8cc41ac5d3ca886a7541fc7874d1ef933
Reviewed-on: https://gerrit.libreoffice.org/59206
Tested-by: Jenkins
Reviewed-by: Maxim Monastirsky <momonasmon@gmail.com>

cui/uiconfig/ui/colorpage.ui

@@ -244,6 +244,7 @@
                         <property name="visible">True</property>
                         <property name="can_focus">True</property>
                         <property name="hscrollbar_policy">never</property>
+                        <property name="vscrollbar_policy">never</property>
                         <property name="shadow_type">in</property>
                         <child>
                           <object class="GtkViewport">