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
18b9f9a021