Notify clients only in case Downloader was started

In case nothing was done there is nothing to notify about

Author: schroda

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/download/Downloader.kt

@@ -73,9 +73,8 @@ class Downloader(
                 }
             }
             logger.debug { "started" }
+            notifier(false)
         }
-
-        notifier(false)
     }
 
     suspend fun stop() {