Try to show actual path in invalid location downloader notification

Instead of the class/hashCode, which doesn't mean much to a user.

app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupNotifier.kt

@@ -14,6 +14,7 @@ import eu.kanade.tachiyomi.util.system.notificationBuilder
 import eu.kanade.tachiyomi.util.system.notify
 import tachiyomi.core.i18n.pluralStringResource
 import tachiyomi.core.i18n.stringResource
+import tachiyomi.core.storage.displayablePath
 import tachiyomi.i18n.MR
 import uy.kohesive.injekt.injectLazy
 import java.io.File
@@ -73,7 +74,7 @@ class BackupNotifier(private val context: Context) {
 
         with(completeNotificationBuilder) {
             setContentTitle(context.stringResource(MR.strings.backup_created))
-            setContentText(file.filePath ?: file.name)
+            setContentText(file.displayablePath)
 
             clearActions()
             addAction(