Installer should not set service_catalog_landing_page: true for web console extension in 3.7

[spadgett]

See openshift/origin-web-console#2078

The new experience is now the default, and the old tech preview flag will be ignored if set.

https://github.com/openshift/openshift-ansible/blob/master/roles/openshift_service_catalog/files/openshift-ansible-catalog-console.js

cc @ewolinetz @sdodson

[ewolinetz]

Low priority but will make part of #5226

[openshift-bot]

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