Fix backgroundColor typing. (#28105)

Summary:
TextInput’s `InputAccessoryView` was using a [deprecated] prop-type as a Flow type, which TheSavior asked me to fix [here](alloy/rn2dts@6ba4b28#r37343692).

## Changelog

[iOS] [Fixed] - Fixes the `InputAccessoryView.backgroundColor` prop’s typing to use `ColorValue`.
Pull Request resolved: #28105

Test Plan:
Passes:

```bash
yarn flow-check-ios
```

Differential Revision: D19956401

Pulled By: TheSavior

fbshipit-source-id: 0c16f292b0143e83235a23712a0a7a11b8317f4e

Author: alloy

Libraries/Components/TextInput/InputAccessoryView.js

@@ -10,14 +10,14 @@
 
 'use strict';
 
-const DeprecatedColorPropType = require('../../DeprecatedPropTypes/DeprecatedColorPropType');
 const Platform = require('../../Utilities/Platform');
 const React = require('react');
 const StyleSheet = require('../../StyleSheet/StyleSheet');
 
 import RCTInputAccessoryViewNativeComponent from './RCTInputAccessoryViewNativeComponent';
 
 import type {ViewStyleProp} from '../../StyleSheet/StyleSheet';
+import type {ColorValue} from '../../StyleSheet/StyleSheetTypes';
 
 /**
  * Note: iOS only
@@ -85,7 +85,7 @@ type Props = $ReadOnly<{|
    */
   nativeID?: ?string,
   style?: ?ViewStyleProp,
-  backgroundColor?: ?DeprecatedColorPropType,
+  backgroundColor?: ?ColorValue,
 |}>;
 
 class InputAccessoryView extends React.Component<Props> {