Fix old Lua breakage

Works around a problem in the old Lua API where a trait lookup would
not find the correct class and make the script crash.

In this instance, `Game.modData.ObjectCreator.FindType("RallyPoint")`
return `OpenRA.Mods.Common.Effects.RallyPoint` instead of the expected
`OpenRA.Mods.Common.RallyPoint`.

The other change is an oversight from the recent warhead rewrites.

Fixes #6728

mods/ra/maps/intervention/map.yaml

@@ -2337,7 +2337,7 @@ Weapons:
 	Nike:
 		Range: 9c0
 	Maverick:
-		Warhead: SpreadDamage
+		Warhead@1Dam: SpreadDamage
 			Damage: 175
 
 Voices:

mods/ra/maps/intervention/mission.lua

@@ -194,7 +194,7 @@ SetupWorld = function()
 		end
 	end)
 
-	Production.SetRallyPoint(WarFactory, Rallypoint)
+--	Production.SetRallyPoint(WarFactory, Rallypoint)
 	Production.EventHandlers.Setup(soviets)
 
 	-- RunAfterDelay is used so that the 'Building captured' and 'Mission accomplished' sounds don't play at the same time