Use env == 'development' instead of env.development?

It's simpler to assume that passed env is just a string without any
extensions, especially when DatabaseTasks are intended to be used also
without rails.

activerecord/lib/active_record/tasks/database_tasks.rb

@@ -175,7 +175,7 @@ def class_for_adapter(adapter)
 
       def each_current_configuration(environment)
         environments = [environment]
-        environments << 'test' if environment.development?
+        environments << 'test' if environment == 'development'
 
         configurations = ActiveRecord::Base.configurations.values_at(*environments)
         configurations.compact.each do |configuration|