Registration form - set default url to EDX member portal if the group…

[janefrommaine]

… number does not exist in the spreadsheet.

Please always provide the GitHub issue(s) your PR is for, as well as test URLs where your change can be observed (before and after):

Fix #211

Test URLs:

• Before: https://main--elixirsolutions--hlxsites.hlx.live/
• After: https://register-group-redirect--elixirsolutions--hlxsites.hlx.live/

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[janefrommaine]

@sforschen, for the group number / id, I only display the validation tooltip when the input field is left empty. Could you test the CSS changes and Rx bin/grp no combinations - the couple I tested worked as expected.

[sforschen]

@janefrommaine I like the tooltip for the blank only that should help with click-happy people like myself.

I have also tested a few combos, blank and random letters and numbers, and all point to working. The CSS changes are also good.