Fix PropType warnings in ColumnHeader and SubNavigation

app/soapbox/components/column_header.js

@@ -19,7 +19,7 @@ export default class ColumnHeader extends React.PureComponent {
   };
 
   static propTypes = {
-    intl: PropTypes.object.isRequired,
+    // intl: PropTypes.object.isRequired,
     title: PropTypes.node,
     icon: PropTypes.string,
     active: PropTypes.bool,

app/soapbox/components/sub_navigation.js

@@ -6,7 +6,6 @@ import Icon from 'soapbox/components/icon';
 export default class SubNavigation extends React.PureComponent {
 
   static propTypes = {
-    intl: PropTypes.object.isRequired,
     message: PropTypes.string,
   }