parse.y: Set the last location of NODE_ARRAY in %w

* parse.y: list_append uses the locations
    of the second argument. So we should set the
    locations of $2 before pass it to list_append.

  e.g. The locations of NODE_ARRAY is fixed:

  ```
  %w[a b]
  ```

  * Before

  ```
  NODE_ARRAY (line: 1, first_lineno: 1, first_column: 0, last_lineno: 0, last_column: -1)
  ```

  * After

  ```
  NODE_ARRAY (line: 1, first_lineno: 1, first_column: 0, last_lineno: 1, last_column: 7)
  ```

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60867 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

parse.y

@@ -4101,8 +4101,8 @@ qword_list	: /* none */
 		| qword_list tSTRING_CONTENT ' '
 		    {
 		    /*%%%*/
-			$$ = list_append($1, $2, &@$);
 			$2->nd_loc = @$;
+			$$ = list_append($1, $2, &@$);
 		    /*%
 			$$ = dispatch2(qwords_add, $1, $2);
 		    %*/