fix: add an asterisk to the 'Email' name of column

[ihor-romaniuk]

TL;DR - I suggest adding the * sign to the email column name to identify that its data is available for masters track only (like for the "student key"). Because the grades API code says that the data for that column only available for the masters mode.

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[leangseu-edx]

LGTM 👍

[ihor-romaniuk]

@jansenk @leangseu-edx Who can help with merging these changes, because we have an approved and hung PR?

[ihor-romaniuk]

@natabene Could you help us manage to merge this PR, please?

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