Revert "ontology: nfo:hasMediaStream does not have a max cardinality in specs"

This reverts commit 6b2dff6e.

We want to avoid data loss until AFTER we have Philip's branch to cope with
this ontology change. This commit will exist in master and 1.4 only.

Philip's branch:

https://git.gnome.org/browse/tracker/log/?h=maxcardinality-change-support