TootComposer: fix placeholder empty

src/timelines/TootComposer.tsx

@@ -183,7 +183,8 @@ function randomChoose<T extends any[]>(
   rn: number,
   K: T,
 ): T extends Array<infer E> ? E : never {
-  const idx = Math.round(rn * K.length) - 1;
+  const idx = Math.floor(rn * K.length);
+  console.log(idx, K.length);
   return K[idx];
 }