Revert "fix for issue 3067"

This reverts commit 041b4b6.

Fixes coqui-ai#3143. The original issue (coqui-ai#3067) was people trying to use
tts.tts_with_vc_to_file() with XTTS and was "fixed" in coqui-ai#3109. But XTTS has
integrated VC and you can just do tts.tts_to_file(..., speaker_wav="..."), there
is no point in passing it through FreeVC afterwards. So, reverting this commit
because it breaks tts.tts_with_vc_to_file() for any model that doesn't have
integrated VC, i.e. all models this method is meant for.

TTS/api.py

@@ -460,7 +460,7 @@ def tts_with_vc(self, text: str, language: str = None, speaker_wav: str = None):
         """
         with tempfile.NamedTemporaryFile(suffix=".wav", delete=False) as fp:
             # Lazy code... save it to a temp file to resample it while reading it for VC
-            self.tts_to_file(text=text, speaker=None, language=language, file_path=fp.name, speaker_wav=speaker_wav)
+            self.tts_to_file(text=text, speaker=None, language=language, file_path=fp.name)
         if self.voice_converter is None:
             self.load_vc_model_by_name("voice_conversion_models/multilingual/vctk/freevc24")
         wav = self.voice_converter.voice_conversion(source_wav=fp.name, target_wav=speaker_wav)