refactor: Remove no longer necessary mx-reply workaround

lib/pages/chat/events/html_message.dart

@@ -59,22 +59,6 @@ class HtmlMessage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    // riot-web is notorious for creating bad reply fallback events from invalid messages which, if
-    // not handled properly, can lead to impersination. As such, we strip the entire `<mx-reply>` tags
-    // here already, to prevent that from happening.
-    // We do *not* do this in an AST and just with simple regex here, as riot-web tends to create
-    // miss-matching tags, and this way we actually correctly identify what we want to strip and, well,
-    // strip it.
-    final renderHtml = html.replaceAll(
-      RegExp(
-        '<mx-reply>.*</mx-reply>',
-        caseSensitive: false,
-        multiLine: false,
-        dotAll: true,
-      ),
-      '',
-    );
-
     final fontSize = AppConfig.messageFontSize * AppConfig.fontSizeFactor;
 
     final linkColor = textColor.withAlpha(150);
@@ -89,7 +73,7 @@ class HtmlMessage extends StatelessWidget {
       padding: HtmlPaddings.only(left: 6, bottom: 0),
     );
 
-    final element = _linkifyHtml(HtmlParser.parseHTML(renderHtml));
+    final element = _linkifyHtml(HtmlParser.parseHTML(html));
 
     // there is no need to pre-validate the html, as we validate it while rendering
     return Html.fromElement(