liblzma: Fix lzma_mt.preset in lzma_stream_encoder_mt_memusage().

It read the filter chain from a wrong variable. This is a similar
bug that was fixed in 9494fb6d0ff41c585326f00aa8f7fe58f8106a5e.
diff --git a/src/liblzma/common/stream_encoder_mt.c b/src/liblzma/common/stream_encoder_mt.c
index 70fe247..6188507 100644
--- a/src/liblzma/common/stream_encoder_mt.c
+++ b/src/liblzma/common/stream_encoder_mt.c
@@ -1095,8 +1095,7 @@
 	const uint64_t inbuf_memusage = options->threads * block_size;
 
 	// Memory usage of the filter encoders
-	uint64_t filters_memusage
-			= lzma_raw_encoder_memusage(options->filters);
+	uint64_t filters_memusage = lzma_raw_encoder_memusage(filters);
 	if (filters_memusage == UINT64_MAX)
 		return UINT64_MAX;