org-babel-expand-noweb-references: Add trialing newline after comments

* lisp/ob-core.el (org-babel-expand-noweb-references): After closing
comment, when using :comments noweb, leave trailing newline after the
closing comment.
* testing/lisp/test-ob-tangle.el (ob-tangle/comment-noweb-relative):
Modify test to check for the newline.

Reported-by: João Pedro <jpedrodeamorim@gmail.com>
Link: https://orgmode.org/list/87fruy2rw6.fsf@ergo

lisp/ob-core.el

@@ -3155,7 +3155,7 @@ block but are passed literally to the \"example-block\"."
 		         (let ((cs (org-babel-tangle-comment-links ,i)))
 		           (concat (c-wrap (car cs)) "\n"
 			           b "\n"
-			          (c-wrap (cadr cs)))))))
+			           (c-wrap (cadr cs)) "\n")))))
 	          (expand-references
 	            (ref)
 	            `(pcase (gethash ,ref org-babel-expand-noweb-references--cache)

testing/lisp/test-ob-tangle.el

@@ -191,8 +191,8 @@ echo 1
 * Main
 #+header: :tangle \"test-ob-tangle.el\" :comments noweb :noweb yes
 #+begin_src emacs-lisp
-1
-<<inner>>
+'(1
+<<inner>>)
 #+end_src"
     (unwind-protect
 	(let ((org-babel-tangle-use-relative-file-links t))
@@ -203,7 +203,7 @@ echo 1
             (goto-char (point-min))
             (and
              (search-forward (concat ";; [[file:" (file-name-nondirectory file) "::inner") nil t)
-              (search-forward ";; inner ends here" nil t))))
+             (search-forward ";; inner ends here\n" nil t))))
       (delete-file "test-ob-tangle.el")))))
 
 (ert-deftest ob-tangle/comment-noweb-absolute ()