Add @payload[:errors] to error.json.jbuilder

- Remove payload[:message], copying v1 behaviour

Author: momo3404

app/views/api/v2/error.json.jbuilder

@@ -3,5 +3,5 @@
 json.partial! 'api/v2/standard_response'
 
 # json.items []
-json.message @payload[:message]
+json.errors @payload[:errors]
 json.details @payload[:details]

spec/views/api/v2/error.json.jbuilder_spec.rb

@@ -23,7 +23,7 @@
     end
 
     it ':errors contains an array of error messages' do
-      expect(@json[:message]).to eql(@errors)
+      expect(@json[:errors]).to eql(@errors)
     end
   end
 end