patch 8.1.1997: no redraw after a popup window filter is invoked

Problem:    No redraw after a popup window filter is invoked.
Solution:   Redraw if needed.
diff --git a/src/version.c b/src/version.c
index 9610b1a..d933bff 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1997,
+/**/
     1996,
 /**/
     1995,