Anyone going to a movie that has a simple “2” in its title should probably have seen the movie that came before it first. But that’s not the case every time, and it’s not a necessity here, as “Equalizer 2” is really more of a companion piece to its 2014 predecessor “The Equalizer.” Both were written by Richard Wenk and directed by Antoine Fuqua, and both star Denzel Washington and feature brief performances by Melissa Leo and Bill [...]