Do not display dialog on periodic save

When periodic save is enabled, do not print the "The data files were
successfully saved" dialog every time io_save_cal() is called.

Reported-by: Håkan Jerning <jerning@home.se>
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>

src/io.c

@@ -445,7 +445,8 @@ void io_save_cal(enum save_display display)
 	io_unset_modified();
 
 	/* Print a message telling data were saved */
-	if (ui_mode == UI_CURSES && conf.system_dialogs) {
+	if (ui_mode == UI_CURSES && display == IO_SAVE_DISPLAY_BAR &&
+	    conf.system_dialogs) {
 		status_mesg(save_success, enter);
 		wgetch(win[KEY].p);
 	}