Fix bu_tts voice

cy/cy_GB/{bu-tts → bu_tts/medium}/MODEL_CARD

@@ -1,4 +1,4 @@
-# Model card for gwryw_gogleddol (medium)
+# Model card for bu_tts (medium)
 
 * Language: cy_GB (Welsh, Great Britain)
 * Speakers: 7

cy/cy_GB/{bu-tts/cy_GB-bu-tts-medium.onnx.json → bu_tts/medium/cy_GB-bu_tts-medium.onnx.json}

@@ -1,14 +1,14 @@
 {
-    "dataset": "code",
+    "dataset": "bu_tts",
     "audio": {
         "sample_rate": 22050,
-        "quality": "trainer"
+        "quality": "medium"
     },
     "espeak": {
         "voice": "cy"
     },
     "language": {
-        "code": "cy"
+        "code": "cy_GB"
     },
     "inference": {
         "noise_scale": 0.667,
@@ -502,4 +502,4 @@
         "benyw-gogledd-1": 6
     },
     "piper_version": "1.0.0"
-}
+}