Merge pull request #2484 from firefly2442/add-physics-commandline-help

add missing physics unit test to --help listing in main.cpp

bin/tests/test_main.cpp

@@ -61,6 +61,7 @@ const char ** tests_get_names()  {
 		"gui",
 		"io",
 		"shaderlang",
+		"physics",
 		NULL
 	};