patch 8.2.1514: multibyte vertical separator is cleared when dragging popup

Problem:    Multibyte vertical separator is cleared when dragging a popup
            window using a multi-byte character for the border.
Solution:   Only clear the character before the window if it is double width.
            (closes #6766)
diff --git a/src/version.c b/src/version.c
index b52d4a8..02457eb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1514,
+/**/
     1513,
 /**/
     1512,