Fixed critical bug EXT-6990 ( Unable to select group on 'People->My groups' tab)

This is workaroung to actually enable selection functionality in that tab. Copied default "allow_select" value from widget to group list xml.
Trivial change, not reviewed.


Real reason is that for some reason base attributes are not loaded from the flat_list_view.xml file.
It is investigated in scope of EXT-6990.

--HG--
branch : product-engine

indra/newview/skins/default/xui/en/panel_people.xml

@@ -299,6 +299,7 @@ Looking for people to hang out with? Try the [secondlife:///app/worldmap World M
      Values are set from appropriate strings at the top of file via LLPeoplePanel::postBuild()
     -->
             <group_list
+             allow_select="true" 
              background_visible="true"
              bg_alpha_color="DkGray2"
              bg_opaque_color="DkGray2"