AttitudeControlTest: compare vectors, not every element

src/modules/mc_att_control/AttitudeControl/AttitudeControlTest.cpp

@@ -7,7 +7,5 @@ TEST(AttitudeControlTest, AllZeroCase)
 {
 	AttitudeControl attitude_control;
 	matrix::Vector3f rate_setpoint = attitude_control.update(Quatf(), Quatf(), 0.f);
-	EXPECT_EQ(rate_setpoint(0), 0.f);
-	EXPECT_EQ(rate_setpoint(1), 0.f);
-	EXPECT_EQ(rate_setpoint(2), 0.f);
+	EXPECT_EQ(rate_setpoint, Vector3f());
 }