fix compilation with GCC version<15

asibfm700/tests/cfg_test.cpp

@@ -57,7 +57,7 @@ int main()
     } else {
         auto v3 = kvh.getValue<std::vector<int>>("E");
         std::cout << "[";
-        for (auto& el : v3.value_or({0, 0, 0})) {
+        for (auto& el : v3.value_or(std::vector<int>{0, 0, 0})) {
             std::cout << el << " ";
         }
         std::cout << "]\n";