Fix missing return in detectlane

[chrberger]

The commented return here: https://github.com/chalmers-revere/opendlv/blob/experiment.idiada/code/system/application/perception/src/detectlane/detectlane.cpp#L75 will make this method fail if the Container is of the wrong type:

https://github.com/chalmers-revere/opendlv/blob/experiment.idiada/code/system/application/perception/src/detectlane/detectlane.cpp#L82-L83

[olbender]

Fixed.