Load todo items on startup

Reload (and show) items into the list box after reading data files.

Reported-by: BARE Willy sprl <barewillysprl@euphonynet.be>
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/calcurse.h

@@ -979,6 +979,7 @@ void ui_todo_draw(int, WINDOW *, int, int, void *);
 enum listbox_row_type ui_todo_row_type(int, void *);
 int ui_todo_height(int, void *);
 void ui_todo_load_items(void);
+void ui_todo_sel_reset(void);
 void ui_todo_sel_move(int);
 void ui_todo_update_panel(int);
 void ui_todo_chg_priority(int);