Fallback text for Matrix poll end events

Right now this doesn't seem to show up on any clients because extensible
events is a total mess, but if you did want to code a client that shows
this fallback without bothering to code real support for polls, you are
easily able to do that. Just pretend the poll end event is a
m.room.message and render it like usual.

src/d2m/actions/poll-end.js

@@ -113,7 +113,8 @@ async function endPoll(closeMessage) {
 		return {
 			username: "Total results including Matrix votes",
 			avatar_url: `${reg.ooye.bridge_origin}/discord/poll-star-avatar.png`,
-			content: messageString
+			content: messageString,
+			flags: DiscordTypes.MessageFlags.SuppressEmbeds
 		}
 	}
 }