Revert "Temporarily skip protocol_ae.t until AnyEvent installed on deskpro."

This reverts commit 82c485e5.

t/protocol_ae.t

@@ -2,10 +2,10 @@
 use strict;
 use warnings;
 
-# use AnyEvent::Impl::Perl;       # (try to) ensure pure-perl loop is used
-# use AnyEvent;
+use AnyEvent::Impl::Perl;       # (try to) ensure pure-perl loop is used
+use AnyEvent;
 
-use Test::More skip_all => 'AnyEvent not installed on deskpro';
+use Test::More;
 use Try::Tiny;
 use POSIX ":sys_wait_h";