Refresh markers on initial page load

[nstjean]

Fixes #6910 (<=== Add issue number here)

I don't know why the LEL layers aren't showing up at all on my localhost, but this shows on a page refresh that the content markers are behaving as they should be.

[codecov]

Codecov Report

Merging #7343 into master will decrease coverage by 33.54%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #7343       +/-   ##
===========================================
- Coverage   81.86%   48.32%   -33.55%     
===========================================
  Files          97       97               
  Lines        5602     5811      +209     
===========================================
- Hits         4586     2808     -1778     
- Misses       1016     3003     +1987

Impacted Files	Coverage Δ
app/models/drupal_content_field_mapper.rb	0% <0%> (-100%)	⬇️
app/mailers/admin_mailer.rb	0% <0%> (-100%)	⬇️
app/mailers/node_mailer.rb	0% <0%> (-100%)	⬇️
app/controllers/talk_controller.rb	0% <0%> (-100%)	⬇️
app/mailers/password_reset_mailer.rb	0% <0%> (-100%)	⬇️
app/models/drupal_content_field_map_editor.rb	0% <0%> (-100%)	⬇️
app/controllers/settings_controller.rb	0% <0%> (-88.89%)	⬇️
app/controllers/features_controller.rb	0% <0%> (-80.71%)	⬇️
app/mailers/welcome_mailer.rb	0% <0%> (-73.34%)	⬇️
lib/utils.rb	30.76% <0%> (-69.24%)	⬇️
... and 45 more

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Screenshots 📸 (click to expand)

7343-test_questions.png

7343-test_embeddable_grids.png

7343-test_signup.png

7343-test_viewing_the_settings_page.png

7343-test_tag_by_author_page.png

7343-test_wiki_page_with_inline_grids.png

7343-test_stats.png

7343-test_viewing_the_dashboard.png

7343-test_searching_an_item_from_the_homepage.png

7343-test_signup_modal_form_validation.png

7343-test_tag_stats.png

7343-test_login_modal_form_validation.png

7343-test_questions_shadow.png

7343-test_login_modal.png

7343-test_profile_page.png

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7343-test_tags.png

7343-test_signup_modal.png

7343-test_wiki.png

7343-test_methods.png

7343-test_tag_page.png

7343-test_blog_page_with_location_modal.png

7343-test_tag_wildcard.png

7343-test_signup_modal_disabled_submit_button_on_empty_username.png

7343-test_embeddable_thumbnail_grids.png

7343-test_front_page_with_navbar_search_autocomplete.png

7343-test_spam_moderation_page.png

7343-test_login.png

7343-test_viewing_the_dropdown_menu.png

7343-test_viewing_question_post.png

7343-test_mobile_displays.png

7343-test_simple-data-grapher_powertag.png

7343-test_front.png

7343-test_question_page.png

7343-test_tag_contributors_page.png

7343-test_blog.png

7343-test_people.png

7343-test_wiki_revisions.png

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[nstjean]

@jywarren This is ready to go, other than the travis test error that seems unrelated?

[jywarren]

Awesome! Yeah... annoying system test! Hm. Maybe need to ask for input from vladimir again, but he's hard at work on publiclab/Leaflet.DistortableImage#512

[jywarren]

Great!