Drop duplicated test.

* Since Emacs 29, ERT test doesn't allow tests with the same name anymore.
* The tests with the same name are actually duplicates, so remove the second
one.

Author: manphiz

test/go-fill-paragraph-test.el

@@ -139,20 +139,6 @@ func main() {
 }"
    ))
 
-(ert-deftest go--fill-paragraph-block-region ()
-  (go--should-fill
-   "
-func main() {
-<  /* Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. */
->}"
-
-   "
-func main() {
-  /* Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do
-     eiusmod tempor incididunt ut labore et dolore magna aliqua. */
-}"
-   ))
-
 (ert-deftest go--fill-paragraph-single-artful ()
   (go--should-fill
    "