fix signining in with IdPs other than 1

[blizzz]

fixes #630

The 'defaults' option in the route configuration is targetted at URL parameters only, but not GET parameters. The dev docs state:

defaults (Optional): If this setting is given, a default value will be assumed for each URL parameter which is not present. The default values are passed in as a key => value par array

Therefore the defaults need to be written into the Controller method's signature.

[PVince81]

👍