komenco: Use fixed version of silex assetic
komenco: Use fixed version of silex assetic

The package has switched to 2.0 and is preparing for the new version of
silex and pimple. It is thus no longer comaptible with the dependencies
we are using. To fix this we need to restrict the version to the 1.x
releases.

bmwcarit/komenco,bmwcarit/komenco,bmwcarit/komenco