Revert "discussion: remove temporary hidden input added for click"

This reverts commit 7aa5fb76

> this change makes title empty when reply
!823 (comment 73439)

/reviewed-on !826

bt5/erp5_discussion/SkinTemplateItem/portal_skins/erp5_discussion/erp5_discussion.js.js

-function clickSaveButtonWithDiscussionPostUidHidden(id, buttonName) {
-  /* this will add respective input box for reply post id (so multiple reply buttons can 
-     safely coexist in one HTML page with one HTML form.
-     Once the button was clicked, the hidden input is removed (so that this can be used
-     multiple times without reloading).   
-  */
-  var hiddenInput = $('<input type="hidden" name="discussion_post_uid">'),
-    form = $('form');
-  hiddenInput.val(id);
-  form.append(hiddenInput);
-  clickSaveButton(buttonName);
-  hiddenInput.remove();
+function deleteDiscussionPost(id){
+  /* this will add respective input box for delete post id (so multiple delete buttons can 
+     safely coexist in one HTML page with one HTML form */
+  $("form").append('<input type="hidden" name="discussion_post_uid" value="' +id +  '">');
+  clickSaveButton("DiscussionThread_deleteDiscussionPost");
 }
 
-function deleteDiscussionPost(id) {
-  clickSaveButtonWithDiscussionPostUidHidden(
-    id,
-    'DiscussionThread_deleteDiscussionPost'
-  );
+function redirectCreateCitedNewDiscussionPost(id){
+  /* this will add respective input box for reply post id (so multiple reply buttons can 
+     safely coexist in one HTML page with one HTML form */
+  $("form").append('<input type="hidden" name="discussion_post_uid" value="' +id +  '">');
+  clickSaveButton("DiscussionThread_redirectCreateNewDiscussionPost");
 }
 
-function redirectCreateCitedNewDiscussionPost(id) {
-  clickSaveButtonWithDiscussionPostUidHidden(
-    id,
-    'DiscussionThread_redirectCreateNewDiscussionPost'
-  );
-}