patch 8.1.1460: popup window border characters may be wrong

Problem:    Popup window border characters may be wrong.
Solution:   Reset the border characters for each popup.  Correct use of
            'ambiwidth'.
diff --git a/src/version.c b/src/version.c
index accea72..eeaa5ef 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1460,
+/**/
     1459,
 /**/
     1458,