Fix matrix reply on modified message for discord

This should fix a bug where doing a reply on a modified message send a message to discord with a webhook containing the message without modification.

src/matrixeventprocessor.ts

@@ -337,7 +337,7 @@ export class MatrixEventProcessor {
         if (profile) {
             params.displayname = profile.displayname;
         }
-        let formattedBodyRegex = new RegExp("<br \/>(.*)<\/blockquote>",'g');
+        let formattedBodyRegex = new RegExp("<br(?: \/)?>(.*)<\/blockquote>",'g');
         let bodyRegex = new RegExp("> <@[^\.>]*:[^\.>]*\.[^\.>]*> (.*)",'g');
         let body: string = "";
         if (event.type !== "m.sticker") {