test: unify all the command line usage logging.

test/testrendertarget.c

@@ -275,8 +275,8 @@ main(int argc, char *argv[])
             }
         }
         if (consumed < 0) {
-            SDL_Log("Usage: %s %s [--composite]\n",
-                    argv[0], SDLTest_CommonUsage(state));
+            static const char *options[] = { "[--composite]", NULL };
+            SDLTest_CommonLogUsage(state, argv[0], options);
             quit(1);
         }
         i += consumed;