Reuse PLAYER_ID_PREVIEW for preview player templating

src/showplanner/Player.tsx

@@ -345,16 +345,12 @@ function LoadedTrackInfo({ id }: { id: number }) {
   );
 }
 
-export function Player({
-  id,
-  isPreviewChannel,
-}: {
-  id: number;
-  isPreviewChannel: boolean;
-}) {
+export function Player({ id }: { id: number }) {
   // Define time remaining (secs) when the play icon should flash.
   const SECS_REMAINING_WARNING = 20;
 
+  const isPreviewChannel = id === PLAYER_ID_PREVIEW;
+
   // We want to force update the selector when we pass the SECS_REMAINING_WARNING barrier.
   const playerState = useSelector(
     (state: RootState) => state.mixer.players[id],
@@ -620,7 +616,7 @@ export function PflPlayer() {
       <span className="mx-1 hover-label always-show">
         Preview Player (Headphones Only)
       </span>
-      <Player id={PLAYER_ID_PREVIEW} isPreviewChannel={true} />
+      <Player id={PLAYER_ID_PREVIEW} />
     </div>
   );
 }

src/showplanner/index.tsx

@@ -70,7 +70,7 @@ function Channel({ id, data }: { id: number; data: PlanItem[] }) {
           </div>
         )}
       </Droppable>
-      <Player id={id} isPreviewChannel={false} />
+      <Player id={id} />
     </div>
   );
 }