t3507: fix indentation

We have some test cases which are indented 7-spaces instead of a tab.
Reindent with a tab instead.

This patch should appear empty with `--ignore-all-space`.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t3507-cherry-pick-conflict.sh

@@ -381,23 +381,23 @@ test_expect_success 'failed commit does not clear REVERT_HEAD' '
 '
 
 test_expect_success 'successful final commit clears revert state' '
-       pristine_detach picked-signed &&
+	pristine_detach picked-signed &&
 
-       test_must_fail git revert picked-signed base &&
-       echo resolved >foo &&
-       test_path_is_file .git/sequencer/todo &&
-       git commit -a &&
-       test_must_fail test_path_exists .git/sequencer
+	test_must_fail git revert picked-signed base &&
+	echo resolved >foo &&
+	test_path_is_file .git/sequencer/todo &&
+	git commit -a &&
+	test_must_fail test_path_exists .git/sequencer
 '
 
 test_expect_success 'reset after final pick clears revert state' '
-       pristine_detach picked-signed &&
+	pristine_detach picked-signed &&
 
-       test_must_fail git revert picked-signed base &&
-       echo resolved >foo &&
-       test_path_is_file .git/sequencer/todo &&
-       git reset &&
-       test_must_fail test_path_exists .git/sequencer
+	test_must_fail git revert picked-signed base &&
+	echo resolved >foo &&
+	test_path_is_file .git/sequencer/todo &&
+	git reset &&
+	test_must_fail test_path_exists .git/sequencer
 '
 
 test_expect_success 'revert conflict, diff3 -m style' '