Remove zone filler arc collision workaround

pcbnew/zone_filler.cpp

@@ -768,17 +768,6 @@ void ZONE_FILLER::buildCopperItemClearances( const ZONE* aZone, PCB_LAYER_ID aLa
                     }
                     else
                     {
-                        // Gives more clearance to arcs (the arc to area drc test is not perfect)
-                        // extra_margin is not enough here
-                        // This is a workaround, that can be removed when (if?) the DRC arcs
-                        // issues are fixed
-                        // The root cause is the fact the DRC approximates the arc shape
-                        // by a segmentlist with a error = +- SHAPE_ARC::DefaultAccuracyForPCB()/2
-                        // and the arc to polygons approximation also creates approximations when
-                        // filling the zone
-                        if( aTrack->Type() == PCB_ARC_T )
-                            gap += SHAPE_ARC::DefaultAccuracyForPCB();
-
                         aTrack->TransformShapeWithClearanceToPolygon( aHoles, aLayer, gap,
                                                                       m_maxError, ERROR_OUTSIDE );
                     }