Update regression checksums after dts calculation fix (r13470).

Before, all dts where wrong, now just the first is a little odd.

Originally committed as revision 13491 to svn://svn.ffmpeg.org/ffmpeg/trunk

tests/libav.regression.ref

@@ -17,7 +17,7 @@ d6fdeb9f7083cc827f9510c6c4517dc0 *./tests/data/b-libav.swf
 ./tests/data/b-libav.swf CRC=0xe14e8847
 745e811e246f3727dc80a7504a18b129 *./tests/data/b-libav.ffm
 380928 ./tests/data/b-libav.ffm
-./tests/data/b-libav.ffm CRC=0x2b71a386
+./tests/data/b-libav.ffm CRC=0xca8f6870
 f8ad5bd78f4d012a8ce9570aa395ac54 *./tests/data/b-libav.flv
 335833 ./tests/data/b-libav.flv
 ./tests/data/b-libav.flv CRC=0xe14e8847