selenium-webdriver: allow <T>=><R> in map (#11770)
selenium-webdriver: allow <T>=><R> in map (#11770)

* selenium-webdriver: allow <T>=><R> in map

Followup from https://github.com/DefinitelyTyped/DefinitelyTyped/pull/11726#issuecomment-251919529

The fix in https://github.com/DefinitelyTyped/DefinitelyTyped/pull/11726 seems to have uncovered a bug in the `map` typings, where the return type is expected to be the same as the argument type. 

This is incorrect as you can map from one type to another.

* Change un-inferred type to any

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