Fix logic for grouping consecutive points in CountriesAndCities

[arne182]

This update corrects the logic for grouping consecutive points in the group_points_with_consecutive_cities method. It ensures sessions are properly split when transitioning between cities or encountering significant time gaps, leading to accurate grouping and filtering of points based on session duration.
This problem had citys showning up in the list that were driven through with over an apart but points not consequtively in that city.