Pcbnew: fix incorrect rotation of thermal spoke for rotated footprints.

If the footprint rotation is not a multiple of 90°, the thermal spokes
were not correctly rotated.
Fixes #13919
https://gitlab.com/kicad/code/kicad/issues/13919

pcbnew/zone_filler.cpp

@@ -1809,7 +1809,7 @@ void ZONE_FILLER::buildThermalSpokes( const ZONE* aZone, PCB_LAYER_ID aLayer,
 
         // If the spokes are at a cardinal angle then we can generate them from a bounding box
         // without trig.
-        if( pad->GetThermalSpokeAngle().IsCardinal() )
+        if( ( pad->GetOrientation() + pad->GetThermalSpokeAngle() ).IsCardinal() )
         {
             BOX2I spokesBox = pad->GetBoundingBox();
             spokesBox.Inflate( thermalReliefGap + epsilon );