Fix issue with vertical lines not visible in the elevation profile tool

[ptitjano]

Description

This PR reverts commit ce96dee6b517bc19a84c9394e48d6cb30e80c1f7.

This commit was introduced to gain some performance when the tolerance is set by using request.setDistanceWithin instead of request.setFilterRect. However, in that case, the providers either use GEOS::distance or GEOS::distanceWithin which is not able to handle the Z component of a Geometry. For example, a purely vertical line, i.e.: LineString(X Y Z1, X Y Z2) will always be to an infinite distance of any geometry according to GEOS.

In practice, this means that a purely vertical line will never be visible in the elevation profile when the tolerance is set. Indeed, the provider will always discard such geometry because of the usage of setDistanceWithin. This issue is fixed by always using setFilterRect. This might introduce a performance penalty but this ensures that the result is always correct.