Hide MDT "Link to MDT Web Service Directory"

[kuvakina]

Hide for:

• showcase-demonstrator.ripple.foundation

• showcase-auth0.ripple.foundation

• showcase-dev.ripple.foundation

[kuvakina]

@tony-shannon @PhilBarrett

Bogdan tried to hide it locally and test it. But after he did it, we couldn't save changes (even if we did nothing) and get EtherCIS error about wrong format.

We had this error before, and Ian helped to fix it. Maybe this field required by EtherCIS.

NOTE:
For now, we suggest maybe do not touch it. Bogdan just made this field not required.