Remove option cfa.transformIntoSingleLoop.programCounterValueProviderFactory.
It does not make a difference, and we can just remove it and always use
the NODE_NUMBER strategy for assigning PC values to CFNodes.

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@13523 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c