Remove extraneous newline from the end of huffman_spec_tables.cc.

I verified that after this change no *.h or *.cc file in
third_party/{quic,http2,spdy,quiche,epoll_server} ends on an empty line.
I also verified that all these files are clang-formatted.

PiperOrigin-RevId: 442806698
diff --git a/quiche/http2/hpack/huffman/huffman_spec_tables.cc b/quiche/http2/hpack/huffman/huffman_spec_tables.cc
index c8251cf..f4b103b 100644
--- a/quiche/http2/hpack/huffman/huffman_spec_tables.cc
+++ b/quiche/http2/hpack/huffman/huffman_spec_tables.cc
@@ -570,4 +570,3 @@
 // clang-format off
 
 }  // namespace http2
-