mailmap: remove legacy.wallymer.com from mm

Signed-off-by: Slade Watkins <srw@sladewatkins.net>

.mailmap

@@ -5,9 +5,9 @@ James Freeman <jimfree@wallymer.com> Jimmy Freeman <jimfree@wallymer.com>
 Luke Conroy <luconroy@wallymer.com> <lukec@onetwentyfour.net>
 Malik O'Leary <mm@wallymer.com> <mm@legacy.wallymer.com>
 Malik O'Leary <mm@wallymer.com> Malik M O'Leary <mm@legacy.wallymer.com>
-Malik O'Leary <mm@legacy.wallymer.com> <malik@exchange.wallymer.com>
+Malik O'Leary <mm@wallymer.com> <malik@exchange.wallymer.com>
 Post Bot <postbot@sladewatkins.net> <postbot@dev.exchange.intra>
 Slade Watkins <srw@sladewatkins.net> <slade@sladewatkins.com>
 Slade Watkins <srw@sladewatkins.net> Slade Rice Watkins <srw@sladewatkins.net>
 Slade Watkins <srw@sladewatkins.net> Slade <slade.rice-watkins@outlook.com>
-Slade Watkins <srw@sladewatkins.net> <watkins@wallymer.com>
+Slade Watkins <srw@sladewatkins.net> <watkins@wallymer.com>