'bp_core_exclude_pages' filter incorrectly applied on multisite

[npetetin]

The 'bp_core_exclude_pages' filter is applied on the 'wp_list_pages_excludes' hook on every blog in a multisite environment, so the pages with the same IDs as the root blog's 'activate' and 'register' pages are excluded although these are not those pages because not from the root blog.

The 'bp_core_exclude_pages' function should start by checking if the current blog is the root blog with the 'bp_is_root_blog' function.

[boonebgorges]

Yikes. Good catch.

[boonebgorges]

(In [5569]) Don't exclude pages in bp_core_exclude_pages() on non-root blogs.
Fixes #3864.
Props npetetin

[boonebgorges]

(In [5570]) Don't exclude pages in bp_core_exclude_pages() on non-root blogs.
Fixes #3864.
Props npetetin