Removed the vi format comments from the source

Vim users can use the [editorconfig plugin](https://github.com/editorconfig/editorconfig-vim) to automatically set tab spacing for the SDL coding style.

Fixes https://github.com/libsdl-org/SDL/issues/6903

src/test/SDL_test_harness.c

@@ -677,5 +677,3 @@ int SDLTest_RunSuites(SDLTest_TestSuiteReference *testSuites[], const char *user
     SDLTest_Log("Exit code: %d", runResult);
     return runResult;
 }
-
-/* vi: set ts=4 sw=4 expandtab: */