Fixed Transform FLIP_Y and FLIP_Z set as identity transform

(cherry picked from commit 882838579238a4fe6d3371ce76042306d5fabd17)

core/variant_call.cpp

@@ -1923,9 +1923,9 @@ void register_variant_methods() {
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "IDENTITY", identity_transform);
 	transform_x.set(-1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0);
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "FLIP_X", transform_x);
-	transform_x.set(1, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, 0);
+	transform_y.set(1, 0, 0, 0, -1, 0, 0, 0, 1, 0, 0, 0);
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "FLIP_Y", transform_y);
-	transform_x.set(1, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0);
+	transform_z.set(1, 0, 0, 0, 1, 0, 0, 0, -1, 0, 0, 0);
 	_VariantCall::add_variant_constant(Variant::TRANSFORM, "FLIP_Z", transform_z);
 
 	_VariantCall::add_variant_constant(Variant::PLANE, "PLANE_YZ", Plane(Vector3(1, 0, 0), 0));