patch 8.2.1509: vertical separator is cleared when dragging a popup window

Problem:    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 using a
            multi-byte character. (closes #6766)
diff --git a/src/version.c b/src/version.c
index 26075ce..1cdd69a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1509,
+/**/
     1508,
 /**/
     1507,