bitstream: fix hash file

In commit d52e17701d73749fe81495b7c956268362ca0bbd
("package/bitstream: bump version to 1.4"), the hash file of the
bitstream package was not properly updated, with the md5 line being
wrong. This commit fixes this problem, which was noticed by
check-package:

package/bitstream/bitstream.hash:2: expected three fields (http://nightly.buildroot.org/#adding-packages-hash)
package/bitstream/bitstream.hash:2: hash size does not match type (http://nightly.buildroot.org/#adding-packages-hash)

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/bitstream/bitstream.hash

@@ -1,5 +1,5 @@
 # From https://get.videolan.org/bitstream/1.4/bitstream-1.4.tar.bz2.md5
-md5 https://get.videolan.org/bitstream/1.4/bitstream-1.4.tar.bz2.md5
+md5 dfb1449194250b2d364d54b5bbac858d  bitstream-1.4.tar.bz2
 # From https://get.videolan.org/bitstream/1.4/bitstream-1.4.tar.bz2.sha256
 sha256 b2484940d3b8733bec9dd1ec1731de428261dff31c9f95874264be9dc9ce786b  bitstream-1.4.tar.bz2
 # Locally computed