App: losing filename when loading kurviger files

[devemux86]

@rumbrummer

But in most cases I have my folder with kurviger files opened in TotalCommander and open the kurviger files via tapping on them in TC - and in this case the behaviour differs.

The behavior differs with kurviger files on every import method, since their “overlay” was added recently.
(this was only implemented with gpx in the past)

It will be available in next version.