model [nfc]: Fix a replit URL in a comment on stream-color swatch

Author: chrisbobbe

lib/api/model/model.dart

@@ -482,7 +482,7 @@ ColorSwatch<StreamColor> streamColorSwatch(int base) {
         .withOpacity(0.3),
 
     // Follows `.sidebar-row__icon` in Vlad's replit:
-    //   <https://replit.com/@VladKorobov/zulip-topic-feed-colors#script.js>
+    //   <https://replit.com/@VladKorobov/zulip-sidebar#script.js>
     //
     // TODO fix bug where our results differ from the replit's (see unit tests)
     StreamColor.iconOnPlainBackground: clamped20to75,