DownloadWorker: Notify dowload failure on network error as well

We can do special handling when ready but failure is a failure regardless.
Notify the user about it.

Also remove non-required default exception parameter as all instances of onFailure
specify an appropriate exception.

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/java/com/aurora/store/data/work/DownloadWorker.kt

@@ -205,7 +205,7 @@ class DownloadWorker @AssistedInject constructor(
         }
     }
 
-    private suspend fun onFailure(exception: Exception = Exception("Something went wrong!")): Result =
+    private suspend fun onFailure(exception: Exception): Result =
         withContext(NonCancellable) {
             Log.i(TAG, "Job failed: ${download.packageName}", exception)
 
@@ -218,10 +218,6 @@ class DownloadWorker @AssistedInject constructor(
                         notifyStatus(DownloadStatus.CANCELLED)
                     }
 
-                    is NoNetworkException -> {
-                        // TODO: Notify user of network failure, maybe a notification & retry option
-                    }
-
                     else -> {
                         notifyStatus(DownloadStatus.FAILED)
                         AuroraApp.events.send(InstallerEvent.Failed(download.packageName).apply {