Fix animation signal caches_cleared firing timing

(cherry picked from commit 962b6a3e8f9d91f92f2547e2da6ba8dbd5a661dc)

scene/animation/animation_player.cpp

@@ -1337,7 +1337,6 @@ float AnimationPlayer::get_current_animation_length() const {
 
 void AnimationPlayer::_animation_changed() {
 	clear_caches();
-	emit_signal("caches_cleared");
 	if (is_playing()) {
 		playback.seeked = true; //need to restart stuff, like audio
 	}
@@ -1376,6 +1375,8 @@ void AnimationPlayer::clear_caches() {
 	cache_update_size = 0;
 	cache_update_prop_size = 0;
 	cache_update_bezier_size = 0;
+
+	emit_signal("caches_cleared");
 }
 
 void AnimationPlayer::set_active(bool p_active) {

scene/animation/animation_tree.cpp

@@ -713,7 +713,6 @@ void AnimationTree::_clear_caches() {
 		memdelete(track_cache[*K]);
 	}
 	playing_caches.clear();
-
 	track_cache.clear();
 	cache_valid = false;
 }