patch 8.1.2228: screenpos() returns wrong values when 'number' is set

Problem:    screenpos() returns wrong values when 'number' is set. (Ben
            Jackson)
Solution:   Compare the column with the window width. (closes #5133)
diff --git a/src/version.c b/src/version.c
index 7b4ebe6..01c95b3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2228,
+/**/
     2227,
 /**/
     2226,