fix(public-calendar): remove toggle functionality from public view

The enabled state cannot be persisted in public views, so the toggle
functionality should not be available. Remove click handler from bullet
icon to prevent misleading interaction.

Co-authored-by: Richard Steinmetz <richard@steinmetz.cloud>
Signed-off-by: Antonia Schwennesen <53372671+zophiana@users.noreply.github.com>