Remove sending part of the multipart emoji workaround (#4361)

src/providers/twitch/IrcMessageHandler.cpp

@@ -311,10 +311,11 @@ std::vector<MessagePtr> IrcMessageHandler::parsePrivMessage(
 void IrcMessageHandler::handlePrivMessage(Communi::IrcPrivateMessage *message,
                                           TwitchIrcServer &server)
 {
-    // This is to make sure that combined emoji go through properly, see
-    // https://github.com/Chatterino/chatterino2/issues/3384 and
+    // This is for compatibility with older Chatterino versions. Twitch didn't use
+    // to allow ZERO WIDTH JOINER unicode character, so Chatterino used ESCAPE_TAG
+    // instead.
+    // See https://github.com/Chatterino/chatterino2/issues/3384 and
     // https://mm2pl.github.io/emoji_rfc.pdf for more details
-    // Constants used here are defined in TwitchChannel.hpp
 
     this->addMessage(
         message, message->target(),