`AdaptiveGridTrackDensity` has a hidden `d0` cut

[andiwand]

acts/Core/src/Vertexing/AdaptiveGridTrackDensity.cpp

Lines 89 to 95 in 2dbf768

	// Calculate bin in d direction
	int centralDBin = getBin(impactParams(0), m_cfg.spatialBinExtent);
	// Check if current track affects grid density
	if (std::abs(centralDBin) > (m_cfg.spatialTrkGridSize - 1) / 2.) {
	DensityMap emptyTrackDensityMap;
	return emptyTrackDensityMap;
	}

I think this should be rather done with a track selection before the vertexing is invoked

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