patch 8.2.2980: popup window test is a bit flaky

Problem:    Popup window test is a bit flaky.
Solution:   Add a redraw command.
diff --git a/src/version.c b/src/version.c
index d55ab1a..ac5cc99 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2980,
+/**/
     2979,
 /**/
     2978,