Reduce flicker when resizing in option menus

Do not update the main windows when resizing the terminal in the general
options menu or in the notification options menu.

Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/calcurse.h

@@ -1093,6 +1093,7 @@ void wins_get_config(void);
 void wins_update_border(int);
 void wins_update_panels(int);
 void wins_update(int);
+void wins_reset_noupdate(void);
 void wins_reset(void);
 void wins_prepare_external(void);
 void wins_unprepare_external(void);