Drop conditional as zeitwerk is the only supported autoloader

Part of the rails 7 upgrade:
ManageIQ#22052

config/initializers/zeitwerk.rb

@@ -1,13 +1,11 @@
-if Rails.application.config.autoloader == :zeitwerk && Rails.autoloaders.main
-  if ENV['DEBUG_MANAGEIQ_ZEITWERK'].present?
-    Zeitwerk::Loader.default_logger = method(:puts)
-    Rails.autoloaders.main.logger = Logger.new($stdout)
-  end
-
-  # These specific directories are for code organization, not namespacing:
-  # TODO: these should be either renamed with good names, the intermediate directory removed
-  # and/or both.
-  Rails.autoloaders.main.collapse(Rails.root.join("lib/manageiq/reporting/charting"))
-  Rails.autoloaders.main.collapse(Rails.root.join("lib/ansible/runner/credential"))
-  Rails.autoloaders.main.collapse(Rails.root.join("lib/pdf_generator"))
+if ENV['DEBUG_MANAGEIQ_ZEITWERK'].present?
+  Zeitwerk::Loader.default_logger = method(:puts)
+  Rails.autoloaders.main.logger = Logger.new($stdout)
 end
+
+# These specific directories are for code organization, not namespacing:
+# TODO: these should be either renamed with good names, the intermediate directory removed
+# and/or both.
+Rails.autoloaders.main.collapse(Rails.root.join("lib/manageiq/reporting/charting"))
+Rails.autoloaders.main.collapse(Rails.root.join("lib/ansible/runner/credential"))
+Rails.autoloaders.main.collapse(Rails.root.join("lib/pdf_generator"))