patch 8.1.1587: redraw problem when sign icons in the number column

Problem:    Redraw problem when sign icons in the number column.
Solution:   Clear and redraw when changing related options.  Right aligh the
            sign icon in the GUI. (Yegappan Lakshmanan, closes #4578)
diff --git a/src/version.c b/src/version.c
index 9d2f26c..37f9e61 100644
--- a/src/version.c
+++ b/src/version.c
@@ -778,6 +778,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1587,
+/**/
     1586,
 /**/
     1585,