Hidden shared calendars should be listed in *Hidden*, not *Shared calendars*

[ChristophWurst]

Steps to reproduce

1. Create user a and user b
2. Log in as user a and share a calendar with b
3. Log in as b and hide the shared calendar

Expected behavior

The calendar moves to the Hidden section of the new sidebar (#5083)

Actual behaviour

The hidden calendar stays in Shared calendars

Calendar app version

5.0

CalDAV-clients used

No response

Browser

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Client operating system

No response

Server operating system

No response

Web server

None

Database engine version

None

PHP engine version

None

Nextcloud version

No response

Updated from an older installed version or fresh install

None

List of activated apps

No response

Nextcloud configuration

No response

Web server error log

No response

Log file

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Browser log

No response

Additional info

No response