Fix sample_controller_test

Add a contributor to the sample types in the test fixes the failing
tests regarding sample type links with referring samples linked to it.

app/helpers/samples_helper.rb

@@ -275,9 +275,9 @@ def sample_type_link(sample, user=User.current_user)
     return nil if Seek::Config.isa_json_compliance_enabled && !sample.sample_type.template_id.nil?
 
     if (sample.sample_type.can_view?(user))
-      link_to sample.sample_type.title,sample.sample_type
+      link_to sample.sample_type.title, sample.sample_type
     else
-      link_to sample.sample_type.title,sample_type_path(sample.sample_type, referring_sample_id:sample.id)
+      link_to sample.sample_type.title, sample_type_path(sample.sample_type, referring_sample_id: sample.id)
     end
   end
 

app/models/sample_type.rb

@@ -189,7 +189,7 @@ def check_referring_sample_permission(user, referring_sample)
     referring_sample.try(:sample_type) == self && referring_sample.can_view?(user)
   end
 
-  # whether it is assocaited with any public samples
+  # whether it is associated with any public samples
   def public_samples?
     samples.joins(:policy).where('policies.access_type >= ?', Policy::VISIBLE).any?
   end