Fix dynamic methods invocation via ::
Fix dynamic methods invocation via ::

Non-static methods should not usually be called via `::`, but as a method call on an object / `$this`.

rodrigoprimo/wp-cli,rodrigoprimo/wp-cli,aaemnnosttv/wp-cli,GaryJones/wp-cli,2ndkauboy/wp-cli,gitlost/wp-cli,trepmal/wp-cli,gitlost/wp-cli,2ndkauboy/wp-cli,2ndkauboy/wp-cli,trepmal/wp-cli,aaemnnosttv/wp-cli,aaemnnosttv/wp-cli,GaryJones/wp-cli,GaryJones/wp-cli,rodrigoprimo/wp-cli,gitlost/wp-cli,trepmal/wp-cli