Fuzzy match should not be used for email addresses

[hwine]

Describe the bug
When searching for an email address, only exact matches should be returned. Since those searches may be done using a person's "alias email" there would be no clues if someone else's record is returned.

To Reproduce
Steps to reproduce the behavior:

1. Go to home page
2. Click on search, enter friend@mozilla.com, start search
3. See fiend@mozilla.com returned. Not the same!

Expected behavior
When I enter a full email address, my expectation is that only exact matches will be returned. (I do appreciate the fuzzy matches for non-email fields.)

Screenshots
none available without privacy issues The actual case involved a transposition of 2 characters in the name -- the one I wanted no longer existed, the non-match that was returned was "very close" w.r.t. all the other fields. I.e. a high likelihood of confusion.