Call the OpenRouter subtitle model the audio file model

Timestamps are a file transcription option, so the model box is named
after the file rather than the format it ends up in.

dikte/config.py

@@ -399,7 +399,7 @@ DEFAULTS = {
     "openrouter_transcribe_model": "openai/gpt-4o-transcribe",
     # What a timestamped run (subtitles) asks OpenRouter for: not every model
     # there returns segment times. Empty -> openai/whisper-1.
-    "openrouter_subtitle_model": "",
+    "openrouter_file_model": "",
     "language": "tr",
     "transcribe_prompt": "",
 
@@ -672,9 +672,9 @@ class Config:
             # to land on rather than reading it from there.
             name = "openai"
         who = TRANSCRIBERS[name]
-        subtitle = self["openrouter_subtitle_model"] if name == "openrouter" else ""
+        file_model = self["openrouter_file_model"] if name == "openrouter" else ""
         return api.Target(name, who.service, self.api_key(who.key),
-                          self[who.url], self[who.model], subtitle.strip())
+                          self[who.url], self[who.model], file_model.strip())
 
     def transcribe_ready(self):
         """Whether speech to text could run right now, without opening Settings."""