Flush settings fails on Android

Flushing settings doesn't work on Android because we don't have a torrc.

So, we get this error:

TorProtocolError: SAVECONF -> 551 Unable to write configuration to disk.

It shouldn't be a blocker (TorSettings isn't awaiting that function), but we can probably skip this step to avoid filling errors in the JS console.

Another alternative is to start supporting torrc, but we don't really want it, since we want TorSettings to be our source of truth (esp. on Android, where the storage would be accessible only through rooting).