Don't use extract() in bp_activity_get_specific()

See #5698

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8519 cdf35c40-ae34-48e0-9cc9-0c9da1808c22
Don't use extract() in bp_activity_add()

See #5698

git-svn-id: https://buddypress.svn.wordpress.org/trunk@8520 cdf35c40-ae34-48e0-9cc9-0c9da1808c22