SPIGOT-4304: Turtle helmet overrides water breathing potion

By: md_5 <git@md-5.net>

paper-server/nms-patches/EntityLiving.patch

@@ -270,11 +270,10 @@
                  this.a(mobeffect);
                  return true;
 -            } else if (mobeffect1.a(mobeffect)) {
--                this.a(mobeffect1, true);
 +                // CraftBukkit start
 +            } else if (event.isOverride()) {
-+                this.effects.put(mobeffect.getMobEffect(), mobeffect);
++                mobeffect1.a(mobeffect);
-+                this.a(mobeffect, true);
+                 this.a(mobeffect1, true);
 +                // CraftBukkit end
                  return true;
              } else {