[calendar] - Hide the URL for ICS (birthdays calendar)

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What steps will reproduce the problem?
https://forum.myroundcube.com/topic/436-calendar-plugin-birthday-ics-url-thunder
bird-lightning-extension-wants-usernamepasssword/page__view__findpost__p__2417

What version of the product are you using? On what operating system?
calendar 22.0.10

Please provide any additional information below.

Implement new configuration key to hide the URL for ICS calendar where the user 
must be logged in (in this case the birthdays calendar). This feature does not 
work for virtual calendars such as "Birthdays". It only works for calendars 
where events are stored in the vevent database table.

Original issue reported on code.google.com by [email protected] on 30 Jun 2015 at 9:57

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Original comment by [email protected] on 30 Jun 2015 at 10:04

• Changed title: [calendar] - Hide the URL for ICS (birthdays calendar)

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Original comment by [email protected] on 5 Jul 2015 at 4:27