Log promise failures instead of ignoring them (#531)

In case the failure does not get handled, it should at least get logged, to prevent silently ignoring it

src/util/defaultPromiseErrorHandler.ts

@@ -0,0 +1,10 @@
+/*
+ * Copyright (C) Contributors to the Suwayomi project
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ */
+
+export const defaultPromiseErrorHandler = (name: string) => (error: any) =>
+    console.error(`${name} failed due to`, error);