t7700-repack: modernize test format

Some tests still use the old format with four spaces indentation.
Standardize the tests to the new format with tab indentation.

Signed-off-by: John Cai <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: john-cai

t/t7700-repack.sh

@@ -460,10 +460,10 @@ test_expect_success '--write-midx -b packs non-kept objects' '
 '
 
 test_expect_success '--write-midx removes stale pack-based bitmaps' '
-       rm -fr repo &&
-       git init repo &&
-       test_when_finished "rm -fr repo" &&
-       (
+	rm -fr repo &&
+	git init repo &&
+	test_when_finished "rm -fr repo" &&
+	(
 		cd repo &&
 		test_commit base &&
 		GIT_TEST_MULTI_PACK_INDEX=0 git repack -Ab &&
@@ -477,7 +477,7 @@ test_expect_success '--write-midx removes stale pack-based bitmaps' '
 		test_path_is_file $midx &&
 		test_path_is_file $midx-$(midx_checksum $objdir).bitmap &&
 		test_path_is_missing $pack_bitmap
-       )
+	)
 '
 
 test_expect_success '--write-midx with --pack-kept-objects' '