Rename brit_champion_cavalry* to brit_champion_chariot*

Patch By: Nescio
Comments By: Stan
Differential Revision: https://code.wildfiregames.com/D2529
This was SVN commit r23716.

binaries/data/mods/public/simulation/templates/structures/brit_fortress.xml

@@ -20,7 +20,7 @@
   <ProductionQueue>
     <Entities datatype="tokens">
       units/{civ}_champion_infantry
-      units/{civ}_champion_cavalry
+      units/{civ}_champion_chariot
       units/{civ}_hero_boudicca
       units/{civ}_hero_caratacos
       units/{civ}_hero_cunobelin

binaries/data/mods/public/simulation/templates/units/brit_champion_chariot_barracks.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Entity parent="units/brit_champion_cavalry">
+<Entity parent="units/brit_champion_chariot">
   <Identity>
     <RequiredTechnology>unlock_champion_units</RequiredTechnology>
   </Identity>