Fixed mobs not dropping items on death

"if (reason == CreatureSpawnEvent.SpawnReason.SPAWNER && blazeBonusSpawnPercent > 0 || !(entity instanceof Blaze))"

This is the replaced code; I believe the problem lies in nesting -- it looks like what was intended was to make Blazes subject to the noLoot flag unless blazeBonusSpawnPercent is greater than 0 (this is how I wrote the replacement code).  But, as written, consider the natural spawning of a Skeleton;

reason evaluates to false;
blazeBonus is irrelevant, as will become clear;
and entity evaluates to false;
our statement becomes if (false && ???? || !(false)).

Since there's no nesting, the statement is evaluated left-to-right; "false && ????" becomes "false", and "!(false)" is simply another way of saying "(true)", so the final statement is "if (false || true)", and the markLootLess code executes -- on a mob that spawned naturally!