Revert "Merge branch 'nd/exclusion-regression-fix'"

This reverts commit 5e57f9c3dfe7dd44a1b56bb5b3327d7a1356ec7c, reversing
changes made to e79112d21024beb997951381db21a70b087d459d.

We will be postponing nd/exclusion-regression-fix topic to later
cycle.
diff --git a/t/t3001-ls-files-others-exclude.sh b/t/t3001-ls-files-others-exclude.sh
index d043078..3fc484e 100755
--- a/t/t3001-ls-files-others-exclude.sh
+++ b/t/t3001-ls-files-others-exclude.sh
@@ -175,10 +175,13 @@
 	grep "^a.1" output
 '
 
-test_expect_success 'excluded directory does not override content patterns' '
+test_expect_success 'excluded directory overrides content patterns' '
 
 	git ls-files --others --exclude="one" --exclude="!one/a.1" >output &&
-	grep "^one/a.1" output
+	if grep "^one/a.1" output
+	then
+		false
+	fi
 '
 
 test_expect_success 'negated directory doesn'\''t affect content patterns' '