patch 8.1.2300: redraw breaks going through list of popup windows

Problem:    Redraw breaks going through list of popup windows.
Solution:   Use different flags for popup_reset_handled(). (closes #5216)
diff --git a/src/version.c b/src/version.c
index 2221d64..13d8616 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2300,
+/**/
     2299,
 /**/
     2298,