Cookie consent page loaded from navigation template instead of footer template.

Following the commit ae9c6869, we can see the cookie consent template was loaded from footer template.
The login and registration templates do not load footer, so the cookie consent template is not being loader either.
With this fix, the cookie consent template is being loaded from navigation template, so it is shown in login and registration pages as well.

lms/templates/footer.html

@@ -140,6 +140,3 @@
     <link rel="stylesheet" type="text/css" href="${url}"></link>
   % endfor
 % endif
-% if settings.FEATURES.get('ENABLE_COOKIE_CONSENT', False):
-  <%include file="widgets/cookie-consent.html" />
-% endif