Special Shrapnel fixes, Flaming shrapnel AP nerf. (#8072)

# About the pull request
special shrapnel now use the correct check, meaning that max shrapnel is
now properly reduced. Thanks to watermelon for noticing it and telling
me how to fix it

In practice this means that flaming/neuro/hornets are now capped at 16
total (From 32).

AP from incind shrapnel reduced from 50 to 20


# Explain why it's good for the game
Currently the incind shrapnel does 665 damage to a queen (before
counting phosphor smoke)

<details>
<summary>Current Shrapnel Against Queen (Combat Ready/Mature)</summary>


https://github.com/user-attachments/assets/4651c6e3-de65-4438-b32c-41b97315e526

</details>



This is enough damage to 1shot every single caste up to and including
non-hedge ravs (both base and berz), as base has 650 health while berz
has 590. Even having max rage, which brings you to 45(!!) armor, isn't
enough to save you, as flaming shrapnel has 50 ap.

<details>
<summary>Against a berz rav on the frontline</summary>


https://github.com/user-attachments/assets/0432dbd8-a897-4c51-9c19-aa268c91a035


</details>


Shrapnel mines probably shouldn't have the killing power of pre nerf OT
rockets?
# Testing Photographs and Procedure
<details>
<summary>New Damage test against drone</summary>
It does around 460 damage total.


https://github.com/user-attachments/assets/59ba7435-1569-41ac-8a76-1f3f3b3dc5e3




</details>


# Changelog
:cl:
balance: Flaming Shrapnel now has 20 AP (from 50)
fix: OT special shrapnel is now properly affected by the cap, meaning
that you can only have 16 shrapnel (from 32)
/:cl:

---------

Co-authored-by: Drathek <[email protected]>

code/datums/ammo/shrapnel.dm

@@ -63,7 +63,7 @@
 	flags_ammo_behavior = AMMO_STOPPED_BY_COVER
 	shell_speed = AMMO_SPEED_TIER_1
 	damage = 30
-	penetration = ARMOR_PENETRATION_TIER_10 //molten metal pierces your armor
+	penetration = ARMOR_PENETRATION_TIER_4
 
 /datum/ammo/bullet/shrapnel/incendiary/set_bullet_traits()
 	. = ..()

code/modules/reagents/Chemistry-Holder.dm

@@ -631,11 +631,11 @@
 		// some upper limits
 		if(shards > max_ex_shards)
 			shards = max_ex_shards
-		if(istype(shard_type, /datum/ammo/bullet/shrapnel/incendiary) && shards > max_ex_shards / INCENDIARY_SHARDS_MAX_REDUCTION) // less max incendiary shards
+		if(ispath(shard_type, /datum/ammo/bullet/shrapnel/incendiary) && shards > max_ex_shards / INCENDIARY_SHARDS_MAX_REDUCTION) // less max incendiary shards
 			shards = max_ex_shards / INCENDIARY_SHARDS_MAX_REDUCTION
-		if(istype(shard_type, /datum/ammo/bullet/shrapnel/hornet_rounds) && shards > max_ex_shards / HORNET_SHARDS_MAX_REDUCTION)
+		else if(ispath(shard_type, /datum/ammo/bullet/shrapnel/hornet_rounds) && shards > max_ex_shards / HORNET_SHARDS_MAX_REDUCTION)
 			shards = max_ex_shards / HORNET_SHARDS_MAX_REDUCTION
-		if(istype(shard_type, /datum/ammo/bullet/shrapnel/neuro) && shards > max_ex_shards / NEURO_SHARDS_MAX_REDUCTION)
+		else if(ispath(shard_type, /datum/ammo/bullet/shrapnel/neuro) && shards > max_ex_shards / NEURO_SHARDS_MAX_REDUCTION)
 			shards = max_ex_shards / NEURO_SHARDS_MAX_REDUCTION
 		if(ex_power > max_ex_power)
 			ex_power = max_ex_power