ui-838 Fix opera DNT redirect destination
Spec MR for: https://gitlab.com/eyeo/adblockplus/abpui/adblockplusui/-/issues/838
This MR replaces wrong destination for adblock_plus_opera_dnt
redirect with: https://help.opera.com/en/latest/security-and-privacy/#tracking
Obsolete links: adblock_browser_android_beta_community
, social_gplus
and social_renren
were already removed in https://gitlab.com/eyeo/specs/spec/-/merge_requests/335