patch 9.0.1670: resetting local option to global value is inconsistent

Problem:    Resetting local option to global value is inconsistent.
Solution:   Handle "<" specifically for 'scrolloff' and 'sidescrolloff'.
            (closes #12594)
diff --git a/src/version.c b/src/version.c
index 316649f..bc2b0b5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1670,
+/**/
     1669,
 /**/
     1668,