[1.21.10] fix nether pathfinder exception in palette scan

[rfresh2]

if air is not in palette, prev code would throw an exception

[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: java.lang.IllegalArgumentException: Unexpected palette resize, bits = 1, added value = Block{minecraft:air}
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at knot//net.minecraft.class_2835.method_74154(class_2835.java:9)
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at knot//net.minecraft.class_6564.method_12291(class_6564.java:33)
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at knot//baritone.process.elytra.NetherPathfinderContext.writeChunkData(NetherPathfinderContext.java:199)
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at knot//baritone.process.elytra.NetherPathfinderContext.lambda$queueForPacking$1(NetherPathfinderContext.java:85)
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
[17:09:42] [pool-39-thread-1/INFO]: [STDERR]: 	at java.base/java.lang.Thread.run(Thread.java:1583)
[17:09:42] [pool-39-thread-2/INFO]: [STDERR]: java.lang.IllegalArgumentException: Unexpected palette resize, bits = 1, added value = Block{minecraft:air}
[17:09:42] [pool-39-thread-2/INFO]: [STDERR]: 	at knot//net.minecraft.class_2835.method_74154(class_2835.java:9)
[17:09:42] [pool-39-thread-2/INFO]: [STDERR]: 	at knot//net.minecraft.class_6564.method_12291(class_6564.java:33)
[17:09:42] [pool-39-thread-2/INFO]: [STDERR]: 	at knot//baritone.process.elytra.NetherPathfinderContext.writeChunkData(NetherPathfinderContext.java:199)
[17:09:42] [pool-39-thread-2/INFO]: [STDERR]: 	at knot//

in pre 1.21.10 baritone the palette is actually resized and edited. which works, but imo its better not to edit the state.

[ZacSharp]

Looks good to me.

Kinda weird we have to do a linear scan with a predicate, but I just checked an older mc version (because I'm lazy) and at least there the scan isn't that terrible. The array palette has to scan anyway, the registry palette just returns true, the singleton palette doesn't have anything to scan, so the only case where this loses in efficiency at all is the hash map palette.