test(composition_sandbox): removed config loaded since not needed

note that this will break (throw runtime errors) the sandbox if it is compiled in a build directory which has had -Dconfig_error_handling=harsh set

tests/composition_sandbox/comp.cpp

@@ -9,7 +9,6 @@ int main(int argv, char* argc[]) {
     } else {
         pathToConfigFile = "config.json";
     }
-    Config::getInstance().loadConfig(pathToConfigFile);
     composition::Composition comp;
     std::vector<std::string> symbols = {"H-1", "He-4"};
     comp.registerSymbol(symbols);