Fix RocketLauncher projectile inheritance.

This projectile inherits the Missile template,
but then overrides it with ballistic behaviour.
This prevents all of the Missile properties that
aren't used by Bullet from being inherited.

mods/cnc/weapons/missiles.yaml

@@ -143,7 +143,13 @@ MammothMissiles:
 	Report: rocket1.aud
 	ValidTargets: Ground
 	TargetActorCenter: true
+	# Remove default Missile properties
+	-Projectile:
 	Projectile: Bullet
+		Blockable: false
+		Image: DRAGON
+		Shadow: true
+		TrailImage: smokey
 		Inaccuracy: 853
 		LaunchAngle: 62
 		ContrailLength: 10