Removed ryan high and medium

Both those models have issues with generation https://github.com/rhasspy/piper/issues/128

system/tts_engines/piper/available_models.json

@@ -337,13 +337,6 @@
         "https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/ljspeech/medium/en_US-ljspeech-medium.onnx.json?download=true"
       ]
     },
-    {
-      "model_name": "en_US-ryan-high",
-      "files_to_download": [
-        "https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/ryan/high/en_US-ryan-high.onnx?download=true",
-        "https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/ryan/high/en_US-ryan-high.onnx.json?download=true"
-      ]
-    },
     {
       "model_name": "en_US-ryan-low",
       "files_to_download": [
@@ -351,13 +344,6 @@
         "https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/ryan/low/en_US-ryan-low.onnx.json?download=true"
       ]
     },
-    {
-      "model_name": "en_US-ryan-medium",
-      "files_to_download": [
-        "https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/ryan/medium/en_US-ryan-medium.onnx?download=true",
-        "https://huggingface.co/rhasspy/piper-voices/resolve/main/en/en_US/ryan/medium/en_US-ryan-medium.onnx.json?download=true"
-      ]
-    },
     {
       "model_name": "es_ES-carlfm-x_low",
       "files_to_download": [