Remove unused lines.

config/initializers/001-redis.rb

@@ -2,13 +2,3 @@ if Rails.env.development? && ENV['DISCOURSE_FLUSH_REDIS']
   puts "Flushing redis (development mode)"
   $redis.flushall
 end
-
-if defined?(PhusionPassenger)
-  PhusionPassenger.on_event(:starting_worker_process) do |forked|
-    if forked
-      Discourse.after_fork
-    else
-      # We're in conservative spawning mode. We don't need to do anything.
-    end
-  end
-end