[Maps] Fix Jebel barkal after rP26955
since only infantry can garrision in stables now.
Reported by: Gurken Kahn https://wildfiregames.com/forum/topic/82754-alpha-26-pre-releaserelease-candidate-build-testing/page/16/#comment-514594
Troubleshooting by @lyv
Ah I messed that sentence up in all ways possible.
Should be: since only infantry can garrison in barracks now.
Shouldn't this have jebelBarkal_templates.citizenSoldier_cavalry then?