Events from unlisted topics show on calendar

[RGJ (Richard - Communiteq)]

To reproduce:

• enable calendar plugin
• enable events
• enable calendar on a category
• create a topic with an event
• unlist the topic (unlisting can also be caused by spam flagging or moderator actions)

Result:

• the topic disappears from the topic list (for non-staff and lower trust levels)
• look at the calendar and see the event is still visible - for everyone.

Expected:

• events from unlisted topics do not appear in the calendar

[zogstrip]

Thanks for the report @RGJ Here’s the fix

FIX: Hide events from unlisted topics on the calendar (#41194)