ayncified `Post::getOmittedLikes`
ayncified `Post::getOmittedLikes`

in process:
1. removed invalid `bind`
2. removed several unused temporary variables

FreeFeed/freefeed-server,golozubov/freefeed-server,FreeFeed/freefeed-server,SiTLar/freefeed-server,golozubov/freefeed-server,SiTLar/freefeed-server,davidmz/pepyatka-server