rubocop: fix various style issues.

test/factories/artist.rb

@@ -5,4 +5,3 @@ FactoryBot.define do
     association :creator, factory: :user
   end
 end
-

test/factories/pool.rb

@@ -1,6 +1,6 @@
 FactoryBot.define do
   factory(:pool) do
-    name {"pool_" + (rand(1_000_000) + 100).to_s}
+    name {"pool_" + rand(100..1000099).to_s}
     association :creator, :factory => :user
     description {FFaker::Lorem.sentences.join(" ")}
   end

test/factories/upload.rb

@@ -39,4 +39,3 @@ FactoryBot.define do
     end
   end
 end
-

test/factories/user.rb

@@ -59,4 +59,3 @@ FactoryBot.define do
     end
   end
 end
-