Only add "Built for OpenStack" logo when builtForOpenStack != 0

Currently, there's logic in the Java code that sets builtForOpenStack
to 1 whenever branding is openstack. This change removes that logic
and instead respects the value for builtForOpenStack set in the pom
(default is 0 in the xslts).

Change-Id: Ida2fa146df91da36f6cc358b8124d740648230e6
Closes-bug: #1317279