Fix fxdx feature string id (#14858)

bedrock/firefox/templates/firefox/developer/includes/features.html

@@ -1,4 +1,3 @@
-
 {#
  This Source Code Form is subject to the terms of the Mozilla Public
  License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -50,7 +49,7 @@
         }
       ),
     ) %}
-      <p>{{ ftl('firefox-developer-inspect-and-refine') }}</p>
+      <p>{{ ftl('firefox-developer-track-css') }}</p>
       <p>
         <a href="https://firefox-source-docs.mozilla.org/devtools-user/web_console/" class="mzp-c-cta-link" rel="external">
           {{ ftl('firefox-developer-learn-about-web-console') }}