refs/debug: re-indent argument list for "prepare"

Re-indent this argument list that's been mis-indented since it was
added in 34c319970d (refs/debug: trace into reflog expiry too,
2021-04-23). This makes a subsequent change smaller.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

refs/debug.c

@@ -364,8 +364,8 @@ struct debug_reflog_expiry_should_prune {
 };
 
 static void debug_reflog_expiry_prepare(const char *refname,
-				    const struct object_id *oid,
-				    void *cb_data)
+					const struct object_id *oid,
+					void *cb_data)
 {
 	struct debug_reflog_expiry_should_prune *prune = cb_data;
 	trace_printf_key(&trace_refs, "reflog_expire_prepare: %s\n", refname);