misc changes: indentation errors, strict mode

The diff is scarier that it should, because I corrected some indentation errors. The space-ignoring diff is:

````
$(document).ready(function() {
+    "use strict";
+
     $('#domains input:radio').addClass('visuallyhidden');

 function change_deposit_button_state(state) {
+    "use strict";
+
     if (state === 'ready') {

 function b2share_init_plupload(selector, url, delete_url, get_file_url) {
+    "use strict";

-        uploader = new plupload.Uploader({
+    var uploader = new plupload.Uploader({
         // General settings

     uploader.bind('FilesAdded', function(up, files) {
-                no_files_with_content = true;
+        var no_files_with_content = true;

         file.unique_filename = responseObj.response;
-                if (uploader.total.queued === 0)
+        if (uploader.total.queued === 0) {
             $('#stopupload').hide();
+        }
````