Fix 1.9-1.15 ChunkHider

SpigotCore_9/src/de/steamwar/techhider/ChunkHider9.java

@@ -62,7 +62,7 @@ public class ChunkHider9 extends ChunkHider8 {
             int primaryBitMask = mapChunkBitMask.get(packet);
             ByteBuf in = Unpooled.wrappedBuffer(mapChunkData.get(packet));
             ByteBuf out = Unpooled.buffer(in.readableBytes() + 64);
-            for(int chunkY = 0; chunkY < p.getWorld().getMaxHeight(); chunkY++) {
+            for(int chunkY = 0; chunkY < p.getWorld().getMaxHeight()/16; chunkY++) {
                 if(((1 << chunkY) & primaryBitMask) == 0)
                     continue;