Remove PVP references to HIGH_RISK world type

As described in 5bebd34bb, HIGH_RISK is not a PVP world type.

Note: this will not affect the world hopper plugin, as it both
explicitly references the high risk world type, and references the
http-api WorldType implementation, not the runelite-api WorldType which
is being modified in this commit.

Fixes runelite/runelite#8605
Fixes runelite/runelite#8624

runelite-api/src/main/java/net/runelite/api/WorldType.java

@@ -84,7 +84,6 @@ public enum WorldType
 		DEADMAN,
 		DEADMAN_TOURNAMENT,
 		PVP,
-		HIGH_RISK,
 		SEASONAL_DEADMAN
 	);