fix: no voice when use cache (#92)

Author: Maxwin-z

manim_voiceover/voiceover_scene.py

@@ -68,6 +68,7 @@ def add_voiceover_text(
 
         dict_ = self.speech_service._wrap_generate_from_text(text, **kwargs)
         tracker = VoiceoverTracker(self, dict_, self.speech_service.cache_dir)
+        self.renderer.skip_animations = self.renderer._original_skipping_status
         self.add_sound(str(Path(self.speech_service.cache_dir) / dict_["final_audio"]))
         self.current_tracker = tracker