Fix Material's shader property binding

ShaderGraph doesn't exist in 3.0.

scene/resources/material.cpp

@@ -178,7 +178,7 @@ void ShaderMaterial::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_shader_param", "param", "value"), &ShaderMaterial::set_shader_param);
 	ClassDB::bind_method(D_METHOD("get_shader_param", "param"), &ShaderMaterial::get_shader_param);
 
-	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "shader", PROPERTY_HINT_RESOURCE_TYPE, "Shader,ShaderGraph"), "set_shader", "get_shader");
+	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "shader", PROPERTY_HINT_RESOURCE_TYPE, "Shader"), "set_shader", "get_shader");
 }
 
 void ShaderMaterial::get_argument_options(const StringName &p_function, int p_idx, List<String> *r_options) const {