Clean up to `bp-core-options.php`:

* Brackets
* Replace `$bp` global with `buddypress()`
* Use `array_keys()` to avoid creating `$value` variables

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8812 cdf35c40-ae34-48e0-9cc9-0c9da1808c22