Fix Magma Barrier damage calculation (#664)

The skill is a shield attack

Co-authored-by: LocalIdentity <localidentity2@gmail.com>

Author: LocalIdentity

src/Data/Skills/act_str.lua

@@ -8932,6 +8932,7 @@ skills["MagmaSprayPlayer"] = {
 				attack = true,
 				area = true,
 				melee = true,
+				shieldAttack = true,
 			},
 			constantStats = {
 				{ "active_skill_base_area_of_effect_radius", 22 },

src/Export/Skills/act_str.txt

@@ -532,7 +532,7 @@ statMap = {
 #skill MagmaSprayPlayer
 #startSets
 #set MagmaSprayPlayer
-#flags attack area melee
+#flags attack area melee shieldAttack
 #mods
 #skillEnd