Fix the call to boxes#find for `vagrant box` commands

lib/vagrant/command/box.rb

@@ -10,14 +10,14 @@ module Vagrant
 
       desc "remove NAME", "Remove a box from the system"
       def remove(name)
-        b = env.boxes.find(env, name)
+        b = env.boxes.find(name)
         raise BoxNotFound.new(:name => name) if !b
         b.destroy
       end
 
       desc "repackage NAME", "Repackage an installed box into a `.box` file."
       def repackage(name)
-        b = env.boxes.find(env, name)
+        b = env.boxes.find(name)
         raise BoxNotFound.new(:name => name) if !b
         b.repackage
       end