also only use aligned in deciding to start burn

if we're aligned then just start the burn, don't worry about
angular velocity.

Signed-off-by: Lamont Granquist <lamont@scriptkiddie.org>

MechJeb2/MechJebModuleNodeExecutor.cs

@@ -165,7 +165,7 @@ public override void OnFixedUpdate()
             if (VesselState.time >= _ignitionUT - LeadTime && State != States.BURN)
                 State = States.LEAD;
 
-            if (VesselState.time >= _ignitionUT && AlignedAndSettled())
+            if (VesselState.time >= _ignitionUT && Aligned())
                 State = States.BURN;
 
             switch (State)