Scale large images even if they are small

Previously we would not scale large resolution images with small file
sizes, but in fact, both resolution and file size constraints should be
enforced.

js/views/file_input_view.js

@@ -47,7 +47,7 @@ var Whisper = Whisper || {};
         },
 
         autoScale: function(file) {
-            if (file.type.split('/')[0] !== 'image' || file.size/1024 < 420) {
+            if (file.type.split('/')[0] !== 'image') {
                 // nothing to do
                 return Promise.resolve(file);
             }