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/mouse.c b/src/mouse.c
index 366cbaf..3e1741f 100644
--- a/src/mouse.c
+++ b/src/mouse.c
@@ -2921,8 +2921,8 @@
 
     if (popup != IGNORE_POPUP)
     {
-	popup_reset_handled();
-	while ((wp = find_next_popup(TRUE)) != NULL)
+	popup_reset_handled(POPUP_HANDLED_1);
+	while ((wp = find_next_popup(TRUE, POPUP_HANDLED_1)) != NULL)
 	{
 	    if (*rowp >= wp->w_winrow && *rowp < wp->w_winrow + popup_height(wp)
 		    && *colp >= wp->w_wincol