Refactor rspec_language_config method

Author: sl4vr

lib/rubocop/cop/rspec/base.rb

@@ -70,7 +70,7 @@ def rspec_pattern_config
         end
 
         def rspec_language_config(*keys)
-          all_cops_config.dig('RSpec', 'Language', *keys)&.map(&:to_sym) || []
+          all_cops_config.dig('RSpec', 'Language', *keys).to_a.map(&:to_sym)
         end
       end
     end