internal/gophers: update neelance's Gerrit email
internal/gophers: update neelance's Gerrit email

The first email here is the one we use for Gerrit assosciation. Recently
Gerrit seems to have changed to only recognizing an account's "preferred
email" and is not recognizing Richard's richard-musiol.de email. Switch
the order with the gmail.com email to use that with Gerrit instead.

Change-Id: Ied744ea665d3d24cf35b3a25e3877387c1fa4978
Reviewed-on: https://go-review.googlesource.com/c/build/+/417582
TryBot-Result: Gopher Robot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Richard Musiol <eb533a4b7e679e5143b37a0022300174aaa46b21@gmail.com>
Reviewed-by: Dmitri Shuralyov <d181b7fea0ec87c86ba5a890ab716db52498e3ba@google.com>
Run-TryBot: Michael Pratt <e7f1edc6d5aa9f6c8c377425db8f1a5816cbbb88@google.com>

golang/build,golang/build,golang/build,golang/build