remove `suppress_comment` from flow config
remove `suppress_comment` from flow config

`suppress_comment` was removed from flow in favor of built-in,
standarized error suppressors (`$FlowFixMe` being one of them). This
change is a prerequisite for updating flow-bin (#308).

ILiedAboutCake/Rustla2,ILiedAboutCake/Rustla2,ILiedAboutCake/Rustla2,ILiedAboutCake/Rustla2