🐛(frontend) fix audio track initialization bug from merge error

Correct wrong copy-paste error in audio track dynamic initialization
that was missed during previous PR merge process.

Fixes initialization logic that was accidentally duplicated or
incorrectly modified during merge conflict resolution.

src/frontend/src/features/rooms/components/Join.tsx

@@ -227,7 +227,7 @@ export const Join = ({
     if (
       audioEnabled &&
       !initialUserChoices.current?.audioEnabled &&
-      !dynamicAudioTrack &&
+      !previewAudioTrack &&
       !dynamicAudioTrack
     ) {
       createAudioTrack()