Desktop: Put log files somewhere else

[Engineer-of-Stuff]

The client currently saves log files in the root directory, which clutters it up.

I propose that the log files should be stored in an alternative location (such as an AppData folder) to keep the synced folder clean.

[k1l1]

I am working on it ;)

[camilasan]

@k1l1 If you need any help, we now have the irc channel #nextcloud-client.

[juliushaertl]

Fixed with #253