Remove the flatten on actors to prevent delegator warning.

lib/flipper/feature.rb

@@ -100,7 +100,7 @@ def clear
     #
     # Returns true if enabled, false if not.
     def enabled?(*actors)
-      actors = actors.flatten.compact.map { |actor| Types::Actor.wrap(actor) }
+      actors = actors.compact.map { |actor| Types::Actor.wrap(actor) }
       actors = nil if actors.empty?
 
       # thing is left for backwards compatibility