`socialMedia` doesn't allow removing info

[trpmy]

For edit:

For schedule:

However, for socialMedia, this rather useful feature of being able to clear up info is not supported. It's more than the usual inconvenience, because the only workaround I can imagine is delete the entire contact and add everything except without the social media info, which is very arduous. I was under the impression it'd be supported because the other edit-related features also support it. Hopefully this can be improved!