feat: add another FooterSlot id alias (#523)

Author: brian-smith-tcril

src/plugin-slots/FooterSlot/index.jsx

@@ -3,7 +3,10 @@ import { PluginSlot } from '@openedx/frontend-plugin-framework';
 import Footer from '../../components/Footer';
 
 const FooterSlot = () => (
-  <PluginSlot id="org.openedx.frontend.layout.footer.v1" idAliases={['footer_slot']}>
+  <PluginSlot
+    id="org.openedx.frontend.layout.footer.v1"
+    idAliases={['footer_slot', 'footer_plugin_slot']}
+  >
     <Footer />
   </PluginSlot>
 );