Tweaked GDI01 Gunboat and turret damage

Made clear that the BoatMissile warhead is an additional bonus rather than an override, reduced the bonus damage and increased gun turret reload delay.
Overall, this makes the Gunboat and turrets behave a bit more like in the original.

mods/cnc/maps/gdi01/weapons.yaml

@@ -1,6 +1,13 @@
 BoatMissile:
-	Warhead: SpreadDamage
+	Warhead@Bonus: SpreadDamage
+		Spread: 128
+		Damage: 20
 		Versus:
-			Heavy: 50
-		Damage: 50
+			None: 50
+			Wood: 100
+			Light: 100
+			Heavy: 100
 		DamageTypes: Prone50Percent, TriggerProne, ExplosionDeath
+
+TurretGun:
+	ReloadDelay: 40