Rename profile header partial (#13639)

This partial is not actually rendered on the user profile, it is only
used by organizations. Moving it to the directory where other
organization-specific partials live!

app/views/organizations/show.html.erb

@@ -3,7 +3,7 @@
 <%= content_for :page_meta do %>
   <%= render "users/meta" %>
 <% end %>
-<%= render "users/profile_header" %>
+<%= render "organizations/header" %>
 <div class="home sub-home" id="index-container"
      data-params="<%= params.merge(sort_by: "published_at", sort_direction: "desc", organization_id: @organization.id).to_json(only: %i[tag organization_id username q sort_by sort_direction]) %>" data-which="<%= @list_of %>"
      data-feed="<%= params[:timeframe] || "base-feed" %>"