Fix "$result contains generic type mysqli_result<mixed> but class mysqli_result is not generic" (#632)

Author: staabm

config/Mysqli.stub

@@ -16,14 +16,3 @@ class mysqli_result implements Traversable, IteratorAggregate
      */
     function fetch_object(string $class = 'stdClass', array $constructor_args = []) {}
 }
-
-/**
- * @template T of object
- * @template TValue
- *
- * @param mysqli_result<TValue> $result
- * @param class-string<T> $class
- * @param array<mixed> $constructor_args
- * @return T|null|false
- */
-function mysqli_fetch_object(mysqli_result $result, string $class = 'stdClass', array $constructor_args = []) {}