Fix a few areas of concern spotted by JITWatch

proxy/src/main/java/com/velocitypowered/proxy/protocol/netty/MinecraftCompressEncoder.java

@@ -41,8 +41,7 @@ public class MinecraftCompressEncoder extends MessageToByteEncoder<ByteBuf> {
     // Follow the advice of https://github.com/ebiggers/libdeflate/blob/master/libdeflate.h#L103
     // here for compression. The maximum buffer size if the data compresses well (which is almost
     // always the case) is one less the input buffer.
-    int offset = msg.readableBytes() < threshold ? 1 : -1;
-    int initialBufferSize = msg.readableBytes() + offset;
+    int initialBufferSize = msg.readableBytes() + 1;
     return MoreByteBufUtils.preferredBuffer(ctx.alloc(), compressor, initialBufferSize);
   }