Make filament-opengl the default graphics mode for studio.

PiperOrigin-RevId: 881362074
Change-Id: Iaa42ddf915b8b146775b2cf0263152b94c586c49

src/experimental/studio/main.cc

@@ -14,12 +14,11 @@
 
 // Main entry point for the Filament-based MuJoCo renderer.
 
-#include <cstddef>
 #include <cstdlib>
+#include <cstring>
 #include <fstream>
 #include <ios>
 #include <iosfwd>
-#include <optional>
 #include <string>
 #include <string_view>
 #include <vector>
@@ -106,7 +105,7 @@ int main(int argc, char** argv, char** envp) {
 
   mujoco::platform::GraphicsMode gfx_mode =
       mujoco::platform::GraphicsModeFromString(
-          gfx, mujoco::platform::GraphicsMode::FilamentVulkan);
+          gfx, mujoco::platform::GraphicsMode::FilamentOpenGl);
 
   const int width = absl::GetFlag(FLAGS_window_width);
   const int height = absl::GetFlag(FLAGS_window_height);