Correct line number for "lonely setter" warning

@caitp What do you think? I'd rather update the fixture file to re-use the `onlySetter` object, but that will require re-setting all the subsequent expected line numbers. If you don't mind the noise, I'd be happy to do this.

Commit message:

> Although the openening block body token is most commonly written on the
> same line as the accessor name, JSHint should generate a warning in
> terms of the name token's line in cases where they differ.