Not tested (so do so on your test site first), but something like:
UPDATE user
SET birthday = '' , birthday_search='0000-00-00'
WHERE birthday = ***
*** is whatever is actually in the field currently which you have not told us
It kinda depends on what is actually in the database instead of the birthday. I have users on my vB4 site with no birthday (it's blank) and the birthday_search just equal to '0000-00-00' and I have no issues editing them. So, perhaps you can be more specific about the exact error and about what *exactly* is in the database for these users.
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