patch 9.0.1691: wrong viewport restored for incsearch and smoothscroll

Problem: wrong viewport restored for incsearch and smoothscroll
Solution: Save and restore skipcol as well

closes: #12713

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
diff --git a/src/version.c b/src/version.c
index d8b9f0e..f0ec4bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1691,
+/**/
     1690,
 /**/
     1689,