org-export: Don't export tables rows containing parameters for formulas

* contrib/lisp/org-export.el (org-export-clean-table): Don't export
  tables rows containing parameters for formulas.

contrib/lisp/org-export.el

@@ -2993,7 +2993,7 @@ it also."
 			 ((org-table-colgroup-line-p row) nil)
 			 ((org-table-cookie-line-p row) nil)
 			 ;; Ignore rows starting with a special marker.
-			 ((string-match "^[ \t]*| *[!_^/] *|" row) nil)
+			 ((string-match "^[ \t]*| *[!_^/$] *|" row) nil)
 			 ;; Remove special column.
 			 ((and specialp
 			       (or (string-match "^\\([ \t]*\\)|-+\\+" row)