Ooyala markers field does not display properly when a single value

The Ooyala markers field is displayed in a rather odd manner if the field is a single-value field. The title of the field is not a label tag, and it's floated off to the right of the field. It seems this happens because it's not using the standard "field_element" theme wrapper, nor is it using the D7 "clearfix" class (it's still using the D6 "clear-block" class. This patch fixes both these issues.