Don't allow swiping away app update install notification

Based on 85ef40d0ffa3c3759d88f800d471fd24db8879de

app/src/main/java/eu/kanade/tachiyomi/data/updater/AppUpdateNotifier.kt

@@ -116,6 +116,7 @@ internal class AppUpdateNotifier(private val context: Context) {
             setOnlyAlertOnce(false)
             setProgress(0, 0, false)
             setContentIntent(installIntent)
+            setOngoing(true)
 
             clearActions()
             addAction(

app/src/main/res/values/strings.xml

@@ -775,7 +775,7 @@
 
     <!--UpdateCheck Notifications-->
     <string name="update_check_notification_download_in_progress">Downloading…</string>
-    <string name="update_check_notification_download_complete">Download complete</string>
+    <string name="update_check_notification_download_complete">Tap to install</string>
     <string name="update_check_notification_download_error">Download error</string>
     <string name="update_check_notification_update_available">New version available!</string>
     <string name="update_check_fdroid_migration_info">A new version is available from the official releases. Tap to learn how to migrate from unofficial F-Droid releases.</string>