reactions: Fix reactions not displayed in all messages view.

We were not updating all the rendered `messages-rows` but just
for the current view.

This bug was introduced in
df180f7bd5

web/src/message_lists.ts

@@ -1,3 +1,4 @@
+import $ from "jquery";
 import assert from "minimalistic-assert";
 
 import * as blueslip from "./blueslip";
@@ -70,6 +71,14 @@ export function all_rendered_message_lists(): MessageList[] {
     return rendered_message_lists;
 }
 
+export function all_rendered_row_for_message_id(message_id: number): JQuery {
+    let $rows = $();
+    for (const msg_list of all_rendered_message_lists()) {
+        $rows = $rows.add(msg_list.get_row(message_id));
+    }
+    return $rows;
+}
+
 export function all_current_message_rows(): JQuery {
     assert(current !== undefined);
     return current.view.$list.find(".message_row");