common: pacman.conf: move extra-testing above extra

Match the repo ordering of stock pacman.conf.

Fixes: 4159a61f ("dbscripts: switch to Git packaging")

roles/common/templates/pacman.conf.j2

@@ -79,13 +79,13 @@ Include = /etc/pacman.d/mirrorlist
 [core]
 Include = /etc/pacman.d/mirrorlist
 
-[extra]
-Include = /etc/pacman.d/mirrorlist
-
 [extra-testing]
 Usage=Search Sync
 Include = /etc/pacman.d/mirrorlist
 
+[extra]
+Include = /etc/pacman.d/mirrorlist
+
 # If you want to run 32 bit applications on your x86_64 system,
 # enable the multilib repositories as required here.