Fix AnimatedSprite doesn't emit animation_finished when changing playback direction

[timothyqiu]

Fixes #61078

The is_over here is preventing the signal from being triggered.

godot/scene/2d/animated_sprite_2d.cpp

Lines 189 to 192 in c41f62c

	if (!is_over) {
	is_over = true;
	emit_signal(SceneStringNames::get_singleton()->animation_finished);
	}

It will be reset to false in _reset_timeout(). When calling play() in animation_finished, set_playing() will be called, but it will return immediately as the playing state is not changed. So the is_over is still true.

godot/scene/2d/animated_sprite_2d.cpp

Lines 368 to 375 in c41f62c

	void AnimatedSprite2D::set_playing(bool p_playing) {
	if (playing == p_playing) {
	return;
	}
	playing = p_playing;
	_reset_timeout();
	set_process_internal(playing);
	}

I think it makes sense to always reset is_over to false in play().

[akien-mga]

Thanks!

[akien-mga]

Cherry-picked for 3.5.