Revert "Display name with with spaces, but keep symbol name underneath"

This reverts commit e0c77bb62c.

We can't use a string with a display string here, anyway, because
it's used in other contexts.

lisp/cus-edit.el

@@ -561,8 +561,7 @@ value unless you are sure you know what it does."
 	   (unless no-suffix
 	     (goto-char (point-max))
 	     (insert "..."))
-	   (propertize (symbol-name symbol)
-                       'display (buffer-string))))))
+	   (buffer-string)))))
 
 (defcustom custom-unlispify-tag-names t
   "Display tag names as words instead of symbols if non-nil."