[MM-60655] Issue in subpath hosting after changes in root.html (#28617)

webapp/channels/src/root.html

@@ -19,11 +19,14 @@
     <link rel="icon" type="image/png" href="/static/images/favicon/favicon-default-64x64.png" sizes="64x64">
     <link rel="icon" type="image/png" href="/static/images/favicon/favicon-default-96x96.png" sizes="96x96">
 
+    <!-- Initialize subpath empty script for subpath support which will be replaced by server/channels/utils/subpath.go -->
+    <script id="publicPathInWindowScript"></script>
+
     <!--
         This "empty" link element is used as a dynamic inject placeholder for the syntax highlighting css styles:
         1. The highlight.js lib finds this element by its 'code_theme' class.
         2. The lib dynamically defines the 'href' attribute and its value to load the required CSS for the detected language by its detection logic.
-        3. This allows it to do at runtime theme switching without havint to modifying the DOM structure.
+        3. This allows it to do at runtime theme switching without having to modify the DOM structure.
         4. The 'href' attribute is empty to prevent unnecessary HTTP requests.
     -->
     <link rel='stylesheet' class='code_theme'>