Tend wounds surgery variants no longer attempt to heal the wrong type…

… of damage (#2646)

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## About The Pull Request


![image](https://github.com/shiptest-ss13/Shiptest/assets/24857008/2e267cd6-7b43-4900-8a20-09e3b8879d30)


![image](https://github.com/shiptest-ss13/Shiptest/assets/24857008/75dad61e-84ac-4bd3-b285-a37e43a49d41)


## Why It's Good For The Game

Prevents a tend wounds heal cycle from targeting a limb that won't
benefit from its flat healing bonus.

## Changelog

:cl:
tweak: tend brute/burns can no longer attempt to (very ineffectively)
heal the other damage type
/:cl:

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Signed-off-by: Theos <[email protected]>

code/modules/surgery/healing.dm

@@ -65,11 +65,11 @@
 	var/urhealedamt_burn = burnhealing
 	if(missinghpbonus)
 		if(target.stat != DEAD)
-			urhealedamt_brute += round((target.getBruteLoss()/ missinghpbonus),0.1)
-			urhealedamt_burn += round((target.getFireLoss()/ missinghpbonus),0.1)
+			urhealedamt_brute += brutehealing ? round((target.getBruteLoss()/ missinghpbonus),0.1) : 0
+			urhealedamt_burn += burnhealing ? round((target.getFireLoss()/ missinghpbonus),0.1) : 0
 		else //less healing bonus for the dead since they're expected to have lots of damage to begin with (to make TW into defib not TOO simple)
-			urhealedamt_brute += round((target.getBruteLoss()/ (missinghpbonus*5)),0.1)
-			urhealedamt_burn += round((target.getFireLoss()/ (missinghpbonus*5)),0.1)
+			urhealedamt_brute += brutehealing ? round((target.getBruteLoss()/ (missinghpbonus*5)),0.1) : 0
+			urhealedamt_burn += burnhealing ? round((target.getFireLoss()/ (missinghpbonus*5)),0.1) : 0
 	if(!get_location_accessible(target, target_zone))
 		urhealedamt_brute *= 0.55
 		urhealedamt_burn *= 0.55