Add 'light argument to some uses of org-babel-get-src-block-info

* lisp/ob-core.el (org-babel-do-key-sequence-in-edit-buffer)
(org-babel-expand-noweb-references)
* lisp/ob-tangle.el (org-babel-tangle): Use 'light argument to
`org-babel-get-src-block-info'.

lisp/ob-core.el

@@ -919,7 +919,7 @@ source code block, otherwise return nil.  With optional prefix
 argument RE-RUN the source-code block is evaluated even if
 results already exist."
   (interactive "P")
-  (let ((info (org-babel-get-src-block-info)))
+  (let ((info (org-babel-get-src-block-info 'light)))
     (when info
       (save-excursion
 	;; go to the results, if there aren't any then run the block
@@ -2365,7 +2365,7 @@ would set the value of argument \"a\" equal to \"9\".  Note that
 these arguments are not evaluated in the current source-code
 block but are passed literally to the \"example-block\"."
   (let* ((parent-buffer (or parent-buffer (current-buffer)))
-         (info (or info (org-babel-get-src-block-info)))
+         (info (or info (org-babel-get-src-block-info 'light)))
          (lang (nth 0 info))
          (body (nth 1 info))
 	 (ob-nww-start org-babel-noweb-wrap-start)

lisp/ob-tangle.el

@@ -185,7 +185,7 @@ used to limit the exported source code blocks by language."
 	       org-babel-default-header-args))
 	    (tangle-file
 	     (when (equal arg '(16))
-	       (or (cdr (assoc :tangle (nth 2 (org-babel-get-src-block-info))))
+	       (or (cdr (assoc :tangle (nth 2 (org-babel-get-src-block-info 'light))))
 		   (user-error "Point is not in a source code block"))))
 	    path-collector)
 	(mapc ;; map over all languages