Use consistent ENV.fetch style

There are no expensive computations here, so no need for a block.

Author: dhh

railties/lib/rails/generators/rails/app/templates/config/puma.rb.tt

@@ -20,7 +20,7 @@
 # Any libraries that use a connection pool or another resource pool should
 # be configured to provide at least as many connections as the number of
 # threads. This includes Active Record's `pool` parameter in `database.yml`.
-threads_count = ENV.fetch("RAILS_MAX_THREADS") { 3 }
+threads_count = ENV.fetch("RAILS_MAX_THREADS", 3)
 threads threads_count, threads_count
 
 # Specifies the `environment` that Puma will run in.
@@ -35,7 +35,7 @@ when "production"
   # It defaults to 1 because it's impossible to reliably detect how many
   # CPU cores are available. Make sure to set the `WEB_CONCURRENCY` environment
   # variable to match the number of processors.
-  workers_count = Integer(ENV.fetch("WEB_CONCURRENCY") { 1 })
+  workers_count = Integer(ENV.fetch("WEB_CONCURRENCY", 1))
   workers workers_count if workers_count > 1
 
   preload_app!
@@ -46,7 +46,7 @@ when "development"
 end
 
 # Specifies the `port` that Puma will listen on to receive requests; default is 3000.
-port ENV.fetch("PORT") { 3000 }
+port ENV.fetch("PORT", 3000)
 
 # Allow puma to be restarted by `bin/rails restart` command.
 plugin :tmp_restart