Update ScentrySupport to avoid compiler warnings

Overriding configureScentry and registerAuthStrategies methods cause "side-effecting nullary method" or "non-nullary method overrides nullary method" warnings depending on whether we omit parenthesis or not.
With this simple update that issue can be avoided without breaking backwards compatibility.
Merge pull request #388 from Athelionas/patch-1

Update ScentrySupport to avoid compiler warnings