Correct case of propTypes property in ES6 React Components. React 16

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/components/structures/IndicatorScrollbar.js

@@ -19,7 +19,7 @@ import PropTypes from "prop-types";
 import AutoHideScrollbar from "./AutoHideScrollbar";
 
 export default class IndicatorScrollbar extends React.Component {
-    static PropTypes = {
+    static propTypes = {
         // If true, the scrollbar will append mx_IndicatorScrollbar_leftOverflowIndicator
         // and mx_IndicatorScrollbar_rightOverflowIndicator elements to the list for positioning
         // by the parent element.

src/components/views/context_menus/GenericElementContextMenu.js

@@ -14,8 +14,6 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 import PropTypes from 'prop-types';
 
@@ -26,7 +24,7 @@ import PropTypes from 'prop-types';
 
 
 export default class GenericElementContextMenu extends React.Component {
-    static PropTypes = {
+    static propTypes = {
         element: PropTypes.element.isRequired,
         // Function to be called when the parent window is resized
         // This can be used to reposition or close the menu on resize and

src/components/views/context_menus/GenericTextContextMenu.js

@@ -14,13 +14,11 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-'use strict';
-
 import React from 'react';
 import PropTypes from 'prop-types';
 
 export default class GenericTextContextMenu extends React.Component {
-    static PropTypes = {
+    static propTypes = {
         message: PropTypes.string.isRequired,
     };