notes: fix malformed tree entry

The mode bits for entries in a tree object should be an octal number
with minimum number of digits.  Do not pad it with 0 to the left.
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

notes.c

@@ -624,8 +624,8 @@ static void write_tree_entry(struct strbuf *buf, unsigned int mode,
 		const char *path, unsigned int path_len, const
 		unsigned char *sha1)
 {
-		strbuf_addf(buf, "%06o %.*s%c", mode, path_len, path, '\0');
-		strbuf_add(buf, sha1, 20);
+	strbuf_addf(buf, "%o %.*s%c", mode, path_len, path, '\0');
+	strbuf_add(buf, sha1, 20);
 }
 
 static void tree_write_stack_init_subtree(struct tree_write_stack *tws,