mailmap: change primary address for Glen Choo

Glen will lose access to his work email soon.

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: chooglen

.mailmap

@@ -80,6 +80,7 @@ Frank Lichtenheld <frank@lichtenheld.de> <flichtenheld@astaro.com>
 Fredrik Kuivinen <frekui@gmail.com> <freku045@student.liu.se>
 Frédéric Heitzmann <frederic.heitzmann@gmail.com>
 Garry Dolley <gdolley@ucla.edu> <gdolley@arpnetworks.com>
+Glen Choo <glencbz@gmail.com> <chooglen@google.com>
 Greg Price <price@mit.edu> <price@MIT.EDU>
 Greg Price <price@mit.edu> <price@ksplice.com>
 Heiko Voigt <hvoigt@hvoigt.net> <git-list@hvoigt.net>