MB-8789: only allow 'Show' button on ro-user views

I.e. even development mode views are not editable for read-only
user. So we should not confuse folks by showing Edit button.

Change-Id: I13a49175e472448684c976d8a9287b209ca96ee4
Reviewed-on: http://review.couchbase.org/28354
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Reviewed-by: Aliaksey Artamonau <aliaksiej.artamonau@gmail.com>