patch 8.1.1857: cannot use modifier with multi-byte character

Problem:    Cannot use modifier with multi-byte character.
Solution:   Allow using a multi-byte character, although it doesn't work
            everywhere.
diff --git a/src/version.c b/src/version.c
index f7be012..5bd944d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1857,
+/**/
     1856,
 /**/
     1855,