fixed linter issues

Author: Quintus3

app/views/admin/activities/index.html.haml

@@ -57,4 +57,4 @@
                     - elsif activity.price == 0
                       %span.badge.badge-primary.size-small= I18n.t('admin.activities.free')
                     - else
-                      %span.badge.badge-warning.size-small= I18n.t('admin.activities.is_not_payable')
+                      %span.badge.badge-warning.size-small= I18n.t('admin.activities.is_not_payable')

app/views/admin/activities/partials/_attendee_table_row.html.haml

@@ -1,7 +1,7 @@
 -#
   @param {participant} participant  - Participant for this row of the table
 
-%tr{ :class => ('in-debt' unless participant.currency.nil? || participant.currency == 0 || participant.paid), 
+%tr{ :class => ('in-debt' unless participant.currency.nil? || participant.currency == 0 || participant.paid),
      :style => ('background-color: rgba(253, 213, 208, 1);' if participant.member.underage_at?(@activity.start_date)),
      :data => { :id => participant.id || '{0}', :'data-activities-id' => @activity.id, :email => participant.member.email || '{3}', reservist: participant.reservist.to_s || 'false' }  }
   %td