Qt: Add missing break in Win32 file export init dialog function

(cherry picked from commit b09161d758807a6a08b5afcbfdb416ca0781a946)

ui/win32/file_dlg_win32.c

@@ -680,6 +680,7 @@ format_handle_wm_initdialog(HWND dlg_hwnd, print_args_t *args) {
             break;
         case print_dissections_expanded:
             SendMessage(cur_ctrl, CB_SETCURSEL, 2, 0);
+            break;
         default:
             g_assert_not_reached();
     }