Fix the AbuseReport seeder

Signed-off-by: Rémy Coutable <remy@rymai.me>

db/fixtures/development/18_abuse_reports.rb

-require 'factory_girl_rails'
+module Db
+  module Fixtures
+    class Development
+      def self.seed
+        Gitlab::Seeder.quiet do
+          (AbuseReport.default_per_page + 3).times do
+            reported_user =
+              User.create!(
+                username: FFaker::Internet.user_name,
+                name: FFaker::Name.name,
+                email: FFaker::Internet.email,
+                confirmed_at: DateTime.now,
+                password: '12345678'
+              )
 
-(AbuseReport.default_per_page + 3).times do
-  FactoryGirl.create(:abuse_report)
+            AbuseReport.create(reporter: User.take, user: reported_user, message: 'User sends spam')
+            print '.'
+          end
+        end
+      end
+    end
+  end
 end
+
+Db::Fixtures::Development.seed