added show_mapserv option  3 (google-api) to venues-view

to keep it inline with venue + event view option 3 (googleapi) has been
added here too.
altered function mapicon in case it's the venues-view

using google-api in the venues-view is not possible for the moment so
when that option is selected and we're in the venues-view it will
default to option 2.
function mapicon: changed params to settings in passing to that function