[cleanup] Remove unused capture in lambda expression

dune/fufem/test/loggertest.cc

@@ -49,7 +49,7 @@ auto checkLogger(std::string format, std::string prefixRegex)
     auto logger = callMakeSynchronizedLogger(sstream, format, mutex);
     auto threads = std::vector<std::thread>();
     for(auto i: Dune::range(3))
-      threads.emplace_back([&,i]() {
+      threads.emplace_back([&]() {
         for([[maybe_unused]] auto i: Dune::range(3))
         {
           using namespace std::chrono_literals;