GPU_offscreen: Add option for high bit depth.

This way we can render in HDR and read the real pixel values.

source/blender/python/intern/gpu_offscreen.c

@@ -354,7 +354,7 @@ static PyObject *pygpu_offscreen_new(PyObject *UNUSED(self), PyObject *args, PyO
 		return NULL;
 	}
 
-	ofs = GPU_offscreen_create(width, height, samples, err_out);
+	ofs = GPU_offscreen_create(width, height, samples, false, err_out);
 
 	if (ofs == NULL) {
 		PyErr_Format(PyExc_RuntimeError,