Add the option for "Allow self-signed cert"

[Plexprofile]

In the current version 1.10 an error message would popup when trying to connect to a webdav server saying :

Error: java.security.cert. CertPath ValidatorException: Trust anchor for certification path not found

This seems to have something to do with the " self-signed cert" settings because I had the same issue with another app called folder sync and had it fixed by enabling the "allow self-signed cert"