.mailmap: fix broken line with multiple emails

Per `git log --author="dogedoge61@gmail.com" --no-mailmap` the second email has
no commits in this repo, so remove it.

Author: DanielEScherzer

.mailmap

@@ -83,7 +83,7 @@ Ben Sago <ogham@users.noreply.github.com> <ogham@bsago.me>
 Ben Striegel <ben.striegel@gmail.com>
 Benjamin Jackman <ben@jackman.biz>
 Benoît Cortier <benoit.cortier@fried-world.eu>
-binarycat <binarycat@envs.net> lolbinarycat <dogedoge61+github@gmail.com> <dogedoge61@gmail.com>
+binarycat <binarycat@envs.net> lolbinarycat <dogedoge61+github@gmail.com>
 Bheesham Persaud <bheesham123@hotmail.com> Bheesham Persaud <bheesham.persaud@live.ca>
 bjorn3 <17426603+bjorn3@users.noreply.github.com> <bjorn3@users.noreply.github.com>
 bjorn3 <17426603+bjorn3@users.noreply.github.com> <bjorn3_gh@protonmail.com>