removing the well potential from WellsManager constructor.

opm/autodiff/ParallelDebugOutput.hpp

@@ -642,7 +642,6 @@ namespace Opm
                                            // as we get the following error otherwise
                                            // with c++ (Debian 4.9.2-10) 4.9.2 and -std=c++11
                                            // converting to ‘const std::unordered_set<std::basic_string<char> >’ from initializer list would use explicit constructor
-                                           std::vector<double>(),
                                            std::unordered_set<std::string>());
 
                 const Wells* wells = wells_manager.c_wells();