make Trk::SurfaceBounds::operator!= non-virtual (was ACTS-1)

Original author Christian Gumpert @cgumpert

The Trk::SurfaceBounds::operator!= is virtual as is the equaility operators. This can lead to inconsistencies if derived classes re-implement these operators in an inconsistent way.

This problem can be resolved by making the inequality operator non-virtual.

Edited Mar 27, 2019 by Moritz Kiehn

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