fix(defaultProps): use undefined environment on React Native (#1546)

Author: silviuaavram

src/downshift.js

@@ -109,7 +109,7 @@ class Downshift extends Component {
     selectedItemChanged: (prevItem, item) => prevItem !== item,
     environment:
       /* istanbul ignore next (ssr) */
-      typeof window === 'undefined' ? undefined : window,
+      typeof window === 'undefined' || isReactNative ? undefined : window,
     stateReducer: (state, stateToSet) => stateToSet,
     suppressRefError: false,
     scrollIntoView,

src/hooks/utils.js

@@ -251,7 +251,7 @@ const defaultProps = {
   scrollIntoView,
   environment:
     /* istanbul ignore next (ssr) */
-    typeof window === 'undefined' ? undefined : window,
+    typeof window === 'undefined' || isReactNative ? undefined : window,
 }
 
 function getDefaultValue(