Fix WindowScroller scrollElement prop types for window

[TrySound]

Ref #938

[codecov-io]

Codecov Report

Merging #939 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #939   +/-   ##
=======================================
  Coverage   89.87%   89.87%           
=======================================
  Files          57       57           
  Lines        1630     1630           
=======================================
  Hits         1465     1465           
  Misses        165      165

Impacted Files	Coverage Δ
source/WindowScroller/WindowScroller.js	85.24% <ø> (ø)	⬆️

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[Hypnosphi]

For some reason, this change didn't get into actual 9.16.0 release:

mkdir test
cd test
yarn init --yes
yarn add react-virtualized
cat node_modules/react-virtualized/dist/es/WindowScroller/WindowScroller.js

Then you can see those lines:

/** Element to attach scroll event listeners. Defaults to window. */
  scrollElement: typeof Element === 'function' ? require('prop-types').instanceOf(Element) : require('prop-types').any,

Instead of the expected

/** Element to attach scroll event listeners. Defaults to window. */
  scrollElement: require('prop-types').oneOfType([require('prop-types').any, typeof Element === 'function' ? require('prop-types').instanceOf(Element) : require('prop-types').any]),

[TrySound]

Yeah, merge collision. Will be fixed in 9.16.1