diff: replace --staged with --cached in t1092 tests

Replace uses of the synonym --staged in t1092 tests with --cached (which
is the real and preferred option). This will allow consistency in the new
tests to be added with the upcoming change to enable the sparse index for
diff.

Signed-off-by: Lessley Dennington <[email protected]>
Reviewed-by: Elijah Newren <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: ldennington

t/t1092-sparse-checkout-compatibility.sh

@@ -401,7 +401,7 @@ test_expect_success 'checkout and reset --hard' '
 	test_all_match git reset --hard update-folder2
 '
 
-test_expect_success 'diff --staged' '
+test_expect_success 'diff --cached' '
 	init_repos &&
 
 	write_script edit-contents <<-\EOF &&
@@ -410,10 +410,10 @@ test_expect_success 'diff --staged' '
 	run_on_all ../edit-contents &&
 
 	test_all_match git diff &&
-	test_all_match git diff --staged &&
+	test_all_match git diff --cached &&
 	test_all_match git add README.md &&
 	test_all_match git diff &&
-	test_all_match git diff --staged
+	test_all_match git diff --cached
 '
 
 # NEEDSWORK: sparse-checkout behaves differently from full-checkout when
@@ -430,8 +430,8 @@ test_expect_success 'diff with renames and conflicts' '
 		test_all_match git checkout rename-base &&
 		test_all_match git checkout $branch -- . &&
 		test_all_match git status --porcelain=v2 &&
-		test_all_match git diff --staged --no-renames &&
-		test_all_match git diff --staged --find-renames || return 1
+		test_all_match git diff --cached --no-renames &&
+		test_all_match git diff --cached --find-renames || return 1
 	done
 '
 
@@ -450,8 +450,8 @@ test_expect_success 'diff with directory/file conflicts' '
 		test_all_match git checkout $branch &&
 		test_all_match git checkout rename-base -- . &&
 		test_all_match git status --porcelain=v2 &&
-		test_all_match git diff --staged --no-renames &&
-		test_all_match git diff --staged --find-renames || return 1
+		test_all_match git diff --cached --no-renames &&
+		test_all_match git diff --cached --find-renames || return 1
 	done
 '