Fixes synthflesh not causing toxin damage on healing brute/burn. (tgs…

…tation#79534)

## About The Pull Request

does what it says on the tin - after the refactor of damage application,
it was going with the minimum value of brute or burn loss vs. the amount
healed, so in fact you could get toxin healing from synthflesh.

## Why It's Good For The Game

synth could probably use some tweaks but this just takes it back to what
it was supposed to do before, it should have a tradeoff of some sort

code/modules/reagents/chemistry/reagents/cat2_medicine_reagents.dm

@@ -497,13 +497,15 @@
 		show_message = 0
 	if(!(methods & (PATCH|TOUCH|VAPOR)))
 		return
-	var/harmies = min(carbies.getBruteLoss(), carbies.adjustBruteLoss(-1.25 * reac_volume, updating_health = FALSE, required_bodytype = affected_bodytype)*-1)
-	var/burnies = min(carbies.getFireLoss(), carbies.adjustFireLoss(-1.25 * reac_volume, updating_health = FALSE, required_bodytype = affected_bodytype)*-1)
+	var/current_bruteloss = carbies.getBruteLoss() // because this will be changed after calling adjustBruteLoss()
+	var/current_fireloss = carbies.getFireLoss() // because this will be changed after calling adjustFireLoss()
+	var/harmies = clamp(carbies.adjustBruteLoss(-1.25 * reac_volume, updating_health = FALSE, required_bodytype = affected_bodytype), 0, current_bruteloss)
+	var/burnies = clamp(carbies.adjustFireLoss(-1.25 * reac_volume, updating_health = FALSE, required_bodytype = affected_bodytype), 0, current_fireloss)
 	for(var/i in carbies.all_wounds)
 		var/datum/wound/iter_wound = i
 		iter_wound.on_synthflesh(reac_volume)
 	var/need_mob_update = harmies + burnies
-	need_mob_update += carbies.adjustToxLoss((harmies+burnies)*(0.5 + (0.25*(1-creation_purity))), updating_health = FALSE, required_biotype = affected_biotype) //0.5 - 0.75
+	need_mob_update = carbies.adjustToxLoss((harmies + burnies)*(0.5 + (0.25*(1-creation_purity))), updating_health = FALSE, required_biotype = affected_biotype) || need_mob_update //0.5 - 0.75
 
 	if(need_mob_update)
 		carbies.updatehealth()