Reverted EnemyUnitPanel.lua

Could not identify the old GEM changes to the panel so I moved the old
file to EnemyUnitPanel.bak.lua and replaced EnemyUnitPanel.lua with the
only BNW version
BarbarianBonus display fix

EnemyUnitPanel.lua was not displaying the correct BarbarianBonus values
because of the mod caching problem with the Worlds, HandicapInfos, and
GameSpeeds tables.