Remove deleted closure compiler warning options

[keram]

These checks are deleted from closure compiler used in latests versions of Clojurescript and lead to NullPointerExceptions if included in projects :closure-warnings configuration.

https://github.com/google/closure-compiler/wiki/Warnings#warnings-categories

I have considered to include comment on which version of ClojureScript & Closure Compiler an option was removed but feels like if it would not be worth the effort and complexity.