ox-latex: Allow hyperref and footnotemark in items description tags

* lisp/ox-latex.el (org-latex-item): Allow hyperref and footnotemark
  in items description tags.  Also remove a unnecessary hack allowing
  footnotemark with an optional argument in the tag.

Initial patch from Rick Frankel.

lisp/ox-latex.el

@@ -1325,20 +1325,6 @@ CONTENTS is nil.  INFO is a plist holding contextual information."
      (when (eq (org-element-type prev) 'footnote-reference)
        org-latex-footnote-separator))
    (cond
-    ;; Use \footnotemark if reference is within an item's tag.
-    ((eq (org-element-type (org-export-get-parent-element footnote-reference))
-	 'item)
-     (if (org-export-footnote-first-reference-p footnote-reference info)
-	 "\\footnotemark"
-       ;; Since we can't specify footnote number as an optional
-       ;; argument within an item tag, some extra work has to be done
-       ;; when the footnote has already been referenced.  In that
-       ;; case, set footnote counter to the desired number, use the
-       ;; footnotemark, then set counter back to its original value.
-       (format
-	"\\setcounter{footnote}{%s}\\footnotemark\\setcounter{footnote}{%s}"
-	(1- (org-export-get-footnote-number footnote-reference info))
-	(org-latex--get-footnote-counter footnote-reference info))))
     ;; Use \footnotemark if the footnote has already been defined.
     ((not (org-export-footnote-first-reference-p footnote-reference info))
      (format "\\footnotemark[%s]{}"
@@ -1612,7 +1598,7 @@ contextual information."
 		     (trans "$\\boxminus$ ")))
 	 (tag (let ((tag (org-element-property :tag item)))
 		;; Check-boxes must belong to the tag.
-		(and tag (format "[%s] "
+		(and tag (format "[{%s}] "
 				 (concat checkbox
 					 (org-export-data tag info)))))))
     (concat counter "\\item" (or tag (concat " " checkbox))