rfc822: fix mangled text when quoting non-latin names

Before the change quoted part looks like:
"=?UTF-8?b?0JDQu9C10LrRgdC10Lkg0JLQuNC90LjRh9C10L3QutC+?=" After the
change it looks like "Алексей Виниченко"

Signed-off-by: Konstantin Kharlamov <Hi-Angel@yandex.ru>
5 jobs for fix-quoting-cyrillic-email-addresses in 24 minutes and 19 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #262931
fedora

00:04:17

passed #262932
ubuntu

00:07:56

 
  Test
passed #262933
flatpak

00:15:29

 
  Deploy
passed #262934
review

00:00:29

failed #262935
allowed to fail manual
stop_review

00:00:23

 
Name Stage Failure
failed
stop_review Deploy
 * [new tag]         geary-0.8.0             -> geary-0.8.0
* [new tag] geary-0.8.1 -> geary-0.8.1
* [new tag] geary-0.8.2 -> geary-0.8.2
* [new tag] geary-0.8.3 -> geary-0.8.3
* [new tag] geary-0.9.0 -> geary-0.9.0
* [new tag] geary-0.9.1 -> geary-0.9.1
Checking out 19716708 as fix-quoting-cyrillic-email-addresses...
fatal: reference is not a tree: 19716708082427af35487ce76e041318ab1f42fe
ERROR: Job failed: exit code 1