squash, fix log formatting

Author: sudden6

auto_tests/toxav_mt_test.cc

@@ -388,7 +388,7 @@ constexpr uint8_t DUMMY_VIDEO::u[];
 constexpr uint8_t DUMMY_VIDEO::v[];
 
 static void test_av(bool combined_av) {
-  std::cout << "Testing Audio and Video in" << (combined_av ? "combined" : "separate") << " threads"
+  std::cout << "Testing Audio and Video in " << (combined_av ? "combined" : "separate") << " threads"
             << std::endl;
   auto toxes = prepare_network(2);