Notify user of error during a page download failure (#7047)

* Notify user of error during a page download failure

* Included the manga title in the error notification

app/src/main/java/eu/kanade/tachiyomi/data/download/Downloader.kt

@@ -401,6 +401,7 @@ class Downloader(
             .onErrorReturn {
                 page.progress = 0
                 page.status = Page.ERROR
+                notifier.onError(it.message, download.chapter.name, download.manga.title)
                 page
             }
     }