ob-table: Fix org-sbe's handling of quotes in cell values

* ob-table.el (org-sbe): org-sbe did the wrong thing when given a
reference to a cell containing quotes or backslashes, because it would
simply wrap any $-prefixed value in quotes, without any escaping. Fix
this by using "%S" (instead of "\"%s\"").

* test-ob-table.el: Add test.

lisp/ob-table.el

@@ -112,7 +112,7 @@ as shown in the example below.
 				      (prog1 nil (setq quote t))
 				    (prog1
 					(cond
-					 (quote (format "\"%s\"" el))
+					 (quote (format "%S" el))
 					 ((stringp el) (org-no-properties el))
 					 (t el))
 				      (setq quote nil))))

testing/lisp/test-ob-table.el

@@ -30,6 +30,28 @@
 ;;   (org-test-at-id "6d2ff4ce-4489-4e2a-9c65-e3f71f77d975"
 ;;     (should (= 2 (sbe take-sqrt (n "4"))))))
 
+(ert-deftest test-ob-table/sbe-quote ()
+  "Test that `org-sbe' can correctly handle cell values containing quotes."
+  (org-test-table-target-expect
+   "
+#+name: identity
+#+begin_src emacs-lisp :eval yes
+  x
+#+end_src
+
+| a\"b\"c | replace |
+"
+   "
+#+name: identity
+#+begin_src emacs-lisp :eval yes
+  x
+#+end_src
+
+| a\"b\"c | a\"b\"c |
+"
+   1
+   "#+TBLFM: $2 = '(org-sbe identity (x $$1))"))
+
 (provide 'test-ob-table)
 
 ;;; test-ob-table.el ends here