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")`
returns `OpenRA.Mods.Common.Effects.RallyPoint` instead of the expected
`OpenRA.Mods.Common.RallyPoint`.

I only commented that line instead of removing it so that I won't forget about it when I port the mission to the new API.

The other change is an oversight from the recent warhead rewrites.

Fixes #6728.