Fix typo in apparently-dead will_unload? method.

Author: jeremy

activesupport/lib/active_support/dependencies.rb

@@ -286,7 +286,7 @@ def autoloaded?(desc)
 
   # Will the provided constant descriptor be unloaded?
   def will_unload?(const_desc)
-    autoloaded?(desc) ||
+    autoloaded?(const_desc) ||
       explicitly_unloadable_constants.include?(to_constant_name(const_desc))
   end