Add view_room to Action enum (#7203)

* Add ViewRoom action to Action enum

Signed-off-by: Renan <renancleyson.f@gmail.com>

* Change view_room occurrences to Action.ViewRoom

Signed-off-by: Renan <renancleyson.f@gmail.com>

* Add missing Action import

src/components/views/context_menus/MessageContextMenu.tsx

@@ -234,7 +234,7 @@ export default class MessageContextMenu extends React.Component<IProps, IState>
 
     private viewInRoom = () => {
         dis.dispatch({
-            action: 'view_room',
+            action: Action.ViewRoom,
             event_id: this.props.mxEvent.getId(),
             highlighted: true,
             room_id: this.props.mxEvent.getRoomId(),