message: log: Adjust coin selection log string
  Replace the outdated function name with words from the English language.
  Logging the function name can be toggled with -logsourcelocations.
diff: @@ -305,7 +305,7 @@ bool KnapsackSolver(const CAmount& nTargetValue, std::vector<OutputGroup>& group
  }
  if (LogAcceptCategory(BCLog::SELECTCOINS)) {
  - std::string log_message{"SelectCoins() best subset: "};
  + std::string log_message{"Coin selection best subset: "};
  for (unsigned int i = 0; i < applicable_groups.size(); i++) {
  if (vfBest[i]) {
  log_message += strprintf("%s ", FormatMoney(applicable_groups[i].m_value));
  