Move ion cannon z offset to sequences.

OpenRA.Mods.Cnc/Effects/IonCannon.cs

@@ -34,7 +34,7 @@ namespace OpenRA.Mods.Cnc.Effects
 
 		public IEnumerable<IRenderable> Render(WorldRenderer wr)
 		{
-			return anim.Render(target.CenterPosition, 1, wr.Palette("effect"), 1.0f);
+			return anim.Render(target.CenterPosition, wr.Palette("effect"));
 		}
 
 		void Finish(World world)

mods/cnc/sequences/misc.yaml

@@ -224,6 +224,7 @@ ionsfx:
 		Start: 0
 		Length: *
 		Offset: 0, -78
+		ZOffset: 1
 
 bomblet:
 	idle: