t9390: expect the correct line count in --strip-blobs-with-ids

In that test case, we expect the line count to be 5, but it is actually
6 lines that we should expect:

	numbers/medium.num
	numbers/small.num
	sequence/know
	whatever
	words/know

Note the empty line at the top: this list is generated via `git log
--format=%n`, and that `%n` stands for "newline", meaning that we _must_
expect an empty line.

This expectation seems to have been broken already in the commit that
added the test case: b6a35f8 (filter-repo: implement
--strip-blobs-with-ids, 2019-05-30). It was hidden for such a long time
by a broken &&-chain, which we will fix next.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

t/t9390-filter-repo.sh

@@ -937,7 +937,7 @@ test_expect_success '--strip-blobs-with-ids' '
 		git filter-repo --strip-blobs-with-ids ../bad-ids --replace-text ../replace-rules &&
 
 		git log --format=%n --name-only | sort | uniq >../filenames &&
-		test_line_count = 5 ../filenames &&
+		test_line_count = 6 ../filenames &&
 		! grep sequence/to ../filenames &&
 		! grep words/to ../filenames &&
 		! grep capricious ../filenames &&