Add back updater offline check

I changed this a few days ago, because it looked like the string had changed. Now we apparently have to deal with both.

Author: mtsgrd

apps/desktop/src/lib/updater/updater.ts

@@ -168,7 +168,9 @@ export class UpdaterService {
 function isOffline(err: any): boolean {
 	return (
 		typeof err === 'string' &&
-		(err.includes('error sending request for') || err.includes('Network Error'))
+		(err.includes('Could not fetch a valid release') ||
+			err.includes('error sending request for') ||
+			err.includes('Network Error'))
 	);
 }