game: Override isDying for Nex, Alchemical hydra, and Drakes

These NPCs transform to a new form in their "dying" phase, thus have
`isDead()` reset to false, despite actually dying. This commit overrides
those particular forms to be considered dead.

runelite-client/src/main/java/net/runelite/client/game/NpcUtil.java

@@ -95,6 +95,12 @@ public boolean isDying(final NPC npc)
 			case NpcID.GROWTHLING:
 			case NpcID.KALPHITE_QUEEN_963: // KQ's first form sometimes regenerates 1hp after reaching 0hp, thus not dying
 				return false;
+			// These NPCs transform and have their `isDead()` reset to `false` despite actually being dead in these forms
+			case NpcID.DRAKE_8613:
+			case NpcID.GUARDIAN_DRAKE_10401:
+			case NpcID.ALCHEMICAL_HYDRA_8634:
+			case NpcID.NEX_11282:
+				return true;
 			default:
 				if (runtimeConfig != null)
 				{