Linter fixes (many unrelated)

app/views/admin/events/_datatable_row.haml

@@ -1,5 +1,6 @@
-- cache ['admin/events/index', conference_id, event, event.submitter, event.speakers, event_types, tracks, difficulty_levels] do
-  %tr{id: "event-#{event.id}"}
+- cache ['admin/events/index', conference_id, event, event.submitter,
+  event.speakers, event_types, tracks, difficulty_levels] do
+  %tr{ id: "event-#{event.id}" }
     %td
       = event.id
 
@@ -38,7 +39,8 @@
       = event_switch_checkbox(event, :require_registration, conference_id)
       - if event.require_registration
         = link_to registered_text(event),
-          registrations_admin_conference_program_event_path(conference_id, event),
+          registrations_admin_conference_program_event_path(conference_id,
+            event),
           class: 'btn btn-xs btn-default'
 
     %td.text-center{ data: { order: event.is_highlight.to_s } }

app/views/admin/events/_datatable_row_rating.haml

@@ -2,11 +2,11 @@
   %div{ data: { toggle: 'tooltip' }, title: rating_tooltip(event, max_rating) }<
     = rating_stars(event.average_rating, max_rating, avgrate: true)
 
-%div.clearfix
+.clearfix
   - if event.voted?(current_user)
     %span.label.label-success
       You voted:
-      = "#{event.user_rating(current_user)}/#{max_rating}"
+      = rating_fraction(event.user_rating(current_user), max_rating)
   - else
     %span.label.label-danger
       Not rated

app/views/admin/events/_export_menu.haml

@@ -1,4 +1,4 @@
-%div.btn-group
+.btn-group
   %button.btn.btn-success.dropdown-toggle{ data: { toggle: 'dropdown' } }
     Export
     = export_format.upcase