Fix config deprecation

Author: mbabker

docs/default-configuration.md

@@ -31,15 +31,15 @@ babdev_websocket:
       enabled:              false
 
       # The interval, in seconds, which connections are pinged.
-      interval:             30 # Required
+      interval:             30
     periodic:
       dbal:
 
         # A list of "Doctrine\DBAL\Connection" services to ping.
         connections:          []
 
         # The interval, in seconds, which connections are pinged.
-        interval:             60 # Required
+        interval:             60
     router:
 
       # The main routing resource to import when loading the websocket server route definitions.

src/DependencyInjection/Configuration.php

@@ -97,7 +97,6 @@ private function addServerSection(ArrayNodeDefinition $rootNode): void
                         ->addDefaultsIfNotSet()
                         ->children()
                             ->integerNode('interval')
-                                ->isRequired()
                                 ->defaultValue(30)
                                 ->min(1)
                                 ->info('The interval, in seconds, which connections are pinged.')
@@ -115,7 +114,6 @@ private function addServerSection(ArrayNodeDefinition $rootNode): void
                                         ->scalarPrototype()->end()
                                     ->end()
                                     ->integerNode('interval')
-                                        ->isRequired()
                                         ->defaultValue(60)
                                         ->min(1)
                                         ->info('The interval, in seconds, which connections are pinged.')