use g_app_info_launch_default_for_uri for open url/path

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 48.80%. Comparing base (d3b7296) to head (68cf5b9).

Files	Patch %	Lines
src/iptux/UiHelper.cpp	85.71%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #578 +/- ## ========================================== + Coverage 48.53% 48.80% +0.26% ========================================== Files 65 65 Lines 8237 8243 +6 ========================================== + Hits 3998 4023 +25 + Misses 4239 4220 -19 ```

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