patch 9.1.0815: "above" virtual text causes wrong 'colorcolumn' position

Problem:  "above" virtual text causes wrong 'colorcolumn' position.
          (@matrdr)
Solution: Use the number of cells instead of bytes for vcol_off_tp.
          (zeertzjq)

fixes: #15946
closes: #15948

Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/version.c b/src/version.c
index aa05ea2..3931067 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    815,
+/**/
     814,
 /**/
     813,