Merge pull request #22430 from edx/REV-954

[REV-954] get optimizely from cloudflare

lms/templates/widgets/optimizely.html

 <%page expression_filter="h"/>
 
 % if settings.OPTIMIZELY_PROJECT_ID and not disable_optimizely and not is_from_mobile_app:
-<script src=${ '//cdn.optimizely.com/js/{}.js'.format(settings.OPTIMIZELY_PROJECT_ID) }></script>
+<script src=${ 'https://www.edx.org/optimizelyjs/{}.js'.format(settings.OPTIMIZELY_PROJECT_ID) }></script>
 % endif