Option to let users delete their account seems to require the Settings component to be active

[imath]

I just deactivated this component, and although this option is set to true and available into the Main settings section of the BP Options Admin screen, I can't find any area in the site to delete my account as a regular user.

At the minimum, the option should be hidden in this case for regular configs (I haven't checked if it was possible to delete his own account on multisite).

[imath]

I just checked Multisite, and just like on regular sites if the BP Settings component is not active it's not possible for a user to delete their account.

We should reflect this requirement by only making this option available when this component is active.

Moves the Account deletion option inside a new Account Settings section of the BP Options WP-Admin Screen

Trac ticket: ​https://buddypress.trac.wordpress.org/ticket/9011

[imath]

In 13630:

BP Options: improve sections naming & listed options/active components

• The option to let members delete their own account is only available when the BP Settings component is active. If it's not, do not display this option into the Administration screen.
• Create a new section for the BP Settings component & move the above option into it.
• Make sure BP Options sections naming is consistent with the names used inside the BP Components Administration tab.

Fixes #9011
Closes ​https://github.com/buddypress/buddypress/pull/180