Update sync_data.sh

sync_data.sh

@@ -206,9 +206,10 @@ sync_data() {
         upload_backup "$backup_path" "${backup_file}"
 
         rm -f "$backup_path"
-    else:
+    else
         echo "Cloudreve directory does not exist yet, waiting for next sync..."
     fi
+    fi # 這裡補上了之前 if 語句缺少的 fi
 
     SYNC_INTERVAL=${SYNC_INTERVAL:-60} # 默认同步间隔改为 60 秒
     echo "Next sync in ${SYNC_INTERVAL} seconds..."