* calendar/todos.el (todos-quit): If quitting

* calendar/todos.el (todos-quit): If quitting
todos-filtered-items-mode makes todos-mode current, don't call
todos-show, which (here wrongly) prompts for a new Todos file.
(todos-delete-category): Fix incorrect quotation mark.
(todos-set-item-priority): Make prefix argument a no-op with
commands for raising or lowering item priority.  Move mistakenly
place right paren to end of defun, where it belongs.