Revert "[test.main] initialize DXTC_CONFIG"

This reverts commit 1b6cfcb6.

dune/xt/common/test/main.hxx

@@ -78,8 +78,6 @@ int main(int argc, char** argv)
   MPIHelper::instance(argc, argv);
 #endif
 
-    DXTC_CONFIG = Configuration(argc, argv);
-
     Logger().create(
 #if DUNE_XT_COMMON_TEST_MAIN_ENABLE_DEBUG_LOGGING
         LOG_CONSOLE | LOG_INFO | LOG_DEBUG | LOG_ERROR