Add Crystal Durham to .mailmap

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Author: CAD97

.mailmap

@@ -138,7 +138,6 @@ Christian Poveda <git@pvdrz.com> <31802960+christianpoveda@users.noreply.github.
 Christian Poveda <git@pvdrz.com> <christianpoveda@uhura.edef.eu>
 Christian Vallentin <vallentinsource@gmail.com>
 Christoffer Buchholz <chris@chrisbuchholz.me>
-Christopher Durham <cad97@cad97.com>
 Clark Gaebel <cg.wowus.cg@gmail.com> <cgaebel@mozilla.com>
 Clement Miao <clementmiao@gmail.com>
 Clément Renault <renault.cle@gmail.com>
@@ -147,6 +146,7 @@ Clinton Ryan <clint.ryan3@gmail.com>
 Taylor Cramer <cramertaylorj@gmail.com> <cramertj@google.com>
 ember arlynx <ember@lunar.town> <corey@octayn.net>
 Crazycolorz5 <Crazycolorz5@gmail.com>
+Crystal Durham <cad97@cad97.com>
 csmoe <35686186+csmoe@users.noreply.github.com>
 Cyryl Płotnicki <cyplo@cyplo.net>
 Damien Schoof <damien.schoof@gmail.com>