Set max capacity for remaining buf

This allows the returned buffer to be a cached empty buf if the original buffer was already fully read

Author: kennytv

common/src/main/java/com/viaversion/viaversion/connection/UserConnectionImpl.java

@@ -373,7 +373,7 @@ private void writeToBuffer(final PacketWrapperImpl wrapper, final ByteBuf buf, f
 
         // Instead of allocating a possible unnecessarily large buffer to write the wrapper contents to,
         // only allocate the remaining bytes and write the rest to the original buf's head directly.
-        final ByteBuf remainingBuf = buf.alloc().buffer(remainingBytes);
+        final ByteBuf remainingBuf = buf.alloc().buffer(remainingBytes, remainingBytes);
         try {
             // Copy before modifying the buffer
             remainingBuf.writeBytes(buf, remainingBytes);