Add the unneeded ternary sniff

[dingo-d]

Is your feature request related to a problem?

A sniff creation was underway here: WordPress/WordPress-Coding-Standards#1771 but it makes no sense to have it in WPCS.

I'll create a PR for this with all the comments in the original PR addressed (add additional test cases).

• I intend to create a pull request to implement this feature.

[jrfnl]

I'd welcome such a PR 🙏🏻