Re-include license info for crossref

[gamboz]

When Janeway 1.8 moved to crossref schema 5.4.0, IIC, the "license" has been removed from the crossref_article.xml template.

Please re-include license info for crossref.

Commit was:

61bc4fe#diff-e5d23f274651da2168032b144415fd992dfd32d17f9adfb59e4d727cd909b075L65

the code was

                {% if article.license %}
                <ai:program name="AccessIndicators">
                    <ai:license_ref>{{ article.license }}</ai:license_ref>
                </ai:program>
                ...