Eliminate macOS Vulkan hint in SDL initialization (#690)

Removed macOS-specific Vulkan library hint from SDL initialization.

src/ui.rs

@@ -69,16 +69,6 @@ impl Drop for Ui {
 
 pub fn sdl_init(flag: sdl3_sys::init::SDL_InitFlags) {
     unsafe {
-        #[cfg(target_os = "macos")]
-        if flag & sdl3_sys::init::SDL_INIT_VIDEO != 0 {
-            sdl3_sys::everything::SDL_SetHint(
-                sdl3_sys::hints::SDL_HINT_VULKAN_LIBRARY,
-                std::ffi::CString::new("/opt/homebrew/lib/libvulkan.dylib")
-                    .unwrap()
-                    .as_ptr(),
-            );
-        }
-
         if sdl3_sys::init::SDL_WasInit(flag) == 0 && !sdl3_sys::init::SDL_InitSubSystem(flag) {
             let err = std::ffi::CStr::from_ptr(sdl3_sys::error::SDL_GetError())
                 .to_str()