patch 9.0.1525: 'smoothscroll' does not always work properly

Problem:    'smoothscroll' does not always work properly.
Solution:   Do not reset w_skipcol after it was intentionally set.  (Luuk van
            Baal, closes #12360, closes #12199, closes #12323)
diff --git a/src/version.c b/src/version.c
index 4964179..e2d91d8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1525,
+/**/
     1524,
 /**/
     1523,