Remove unused propType for CollapsibleSection

src/components/CollapsibleSection/index.js

@@ -1,18 +1,26 @@
 import React from 'react';
 import {View, TouchableOpacity} from 'react-native';
+import PropTypes from 'prop-types';
 import Collapsible from './Collapsible';
 import Text from '../Text';
-import {propTypes, defaultProps} from './CollapsibleSectionPropTypes';
 import styles from '../../styles/styles';
 import Icon from '../Icon';
 import {DownArrow, UpArrow} from '../Icon/Expensicons';
 
+const propTypes = {
+    /** Title of the Collapsible section */
+    title: PropTypes.string.isRequired,
+
+    /** Children to display inside the Collapsible component */
+    children: PropTypes.node.isRequired,
+};
+
 class CollapsibleSection extends React.Component {
     constructor(props) {
         super(props);
         this.toggleSection = this.toggleSection.bind(this);
         this.state = {
-            isExpanded: this.props.isExpanded,
+            isExpanded: false,
         };
     }
 
@@ -48,6 +56,5 @@ class CollapsibleSection extends React.Component {
     }
 }
 
-CollapsibleSection.defaultProps = defaultProps;
 CollapsibleSection.propTypes = propTypes;
 export default CollapsibleSection;