Fix unknown type access on mgt props

Signed-off-by: Musale Martin <[email protected]>

Author: musale

samples/react-chat/src/components/ChatListTemplate/ChatListTemplate.tsx

@@ -4,7 +4,7 @@ import { Chat } from '@microsoft/microsoft-graph-types';
 import ChatItem, { ChatInteractionProps } from '../ChatItem/ChatItem';
 
 const ChatListTemplate = (props: MgtTemplateProps & ChatInteractionProps) => {
-  const { value } = props.dataContext;
+  const { value } = props.dataContext as { value: Chat[] };
   const chats: Chat[] = value;
   // Select a default chat to display
   // props.onSelected(chats[0]);