metadata mapping error with start and end dates with wekeo

[anesson-cs]

With wekeo, day_month_year anchor makes startTimeFromAscendingNode and completionTimeFromAscendingNode properties be mapped with $.properties.startDate and $.properties.endDate but these paths are outdated. The new paths are $.properties.startdate and $.properties.enddate. Check if it works with all product types using this anchor and if other anchors must be updated too.