web/queue: add subtitle args when output has subtitles

not when there are 3 tunnels, that was dumb of me, my bad

web/src/lib/task-manager/queue.ts

@@ -69,7 +69,7 @@ const makeRemuxArgs = (info: CobaltLocalProcessingResponse) => {
     if (["merge", "remux"].includes(info.type)) {
         ffargs.push("-c:a", "copy");
 
-        if (info.tunnel.length === 3) {
+        if (info.output.subtitles) {
             ffargs.push(
                 "-c:s",
                 info.output.filename.endsWith(".mp4") ? "mov_text" : "webvtt"

web/src/lib/types/api.ts

@@ -73,6 +73,7 @@ export type CobaltLocalProcessingResponse = {
         type: string, // mimetype
         filename: string,
         metadata?: CobaltFileMetadata,
+        subtitles?: boolean,
     },
 
     audio?: {