Fix clientside module test & update changelog

Author: jowlo

CHANGELOG.md

@@ -13,6 +13,9 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 - [#2734](https://github.com/plotly/dash/pull/2734) Configure CI for Python 3.10 [#1863](https://github.com/plotly/dash/issues/1863)
 - [#2735](https://github.com/plotly/dash/pull/2735) Configure CI for Python 3.8 and 3.12, drop support for Python 3.6 and Python 3.7 [#2736](https://github.com/plotly/dash/issues/2736)
 
+## Added
+- [#2730](https://github.com/plotly/dash/pull/2721) Load script files with `.mjs` ending as js modules
+
 ## [2.15.0] - 2024-01-31
 
 ## Added
@@ -30,7 +33,6 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ## Changed
 - [#2652](https://github.com/plotly/dash/pull/2652) dcc.Clipboard supports htm_content and triggers a copy to clipboard when n_clicks are changed
 - [#2721](https://github.com/plotly/dash/pull/2721) Remove ansi2html, fixes [#2613](https://github.com/plotly/dash/issues/2713)
-- [#2730](https://github.com/plotly/dash/pull/2721) Load script files with `.mjs` ending as js modules
 
 ## [2.14.2] - 2023-11-27
 

tests/integration/clientside/assets/clientside.mjs

@@ -1,5 +1,5 @@
 import {display} from "./clientsideModule.mjs";
 
-window.dash_clientside.clientside_module = Object.assign({}, window.dash_clientside, {
+window.dash_clientside.clientside_module = Object.assign({}, window.dash_clientside.clientside_module, {
 	display
 });