don't save things to img_dir

lib/squib/dsl/save_png.rb

@@ -29,7 +29,6 @@ module Squib
 
       def run(opts)
         warn_if_unexpected opts
-        Dir.chdir(deck.img_dir) do
         range = Args.extract_range opts, deck
         batch = Args.extract_save_batch opts, deck
         @bar.start("Saving PNGs to #{batch.summary}", deck.size) do |bar|
@@ -37,11 +36,9 @@ module Squib
             deck.cards[i].save_png(batch[i])
             bar.increment
           end
-
+        end
       end
     end
 
   end
 end
-  end
-end