Fixes one handed dswords (#15289)

* One handed deswords

* Reverts unintended changes

Got a bit confused, I need more coffee

code/game/objects/items/weapons/twohanded.dm

@@ -68,6 +68,9 @@
 	if(user.get_inactive_hand())
 		to_chat(user, "<span class='warning'>You need your other hand to be empty!</span>")
 		return FALSE
+	if(!user.has_both_hands())
+		to_chat(user, "<span class='warning'>You need both hands to wield this!</span>")
+		return FALSE
 	wielded = TRUE
 	force = force_wielded
 	if(sharp_when_wielded)

code/modules/surgery/organs/helpers.dm

@@ -66,6 +66,13 @@
 		return TRUE
 	return FALSE
 
+/mob/proc/has_both_hands()
+	return TRUE
+
+/mob/living/carbon/human/has_both_hands()
+	if(has_left_hand() && has_right_hand())
+		return TRUE
+	return FALSE
 
 //Limb numbers
 /mob/proc/get_num_arms()