Remove redundant method PredicateCPA.getFormulaManager().
The Solver instance now provides a reference to FormulaManagerView,
as it completely encapsulates everything related to an SMT solver.

git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14963 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c