Metadata Standard Convert does not deserialize ForeignKey Corrently

[lockwobr]

I found that the AsStandard.Convert() function does not seem to include the ForeignKeys. Looking at the wirelog I found its a xml deserialize error it seems, the name in the log has an s and by adding the s in the code to be METADATA-FOREIGN_KEYS fixed the issue, I could open a PR for this but I really have only one server to test this against, and don't want to make braking changes for others.