Include leaflet import only when no here maps provider is configured

[fblupi]

Fixes #33

Screen.Recording.2023-10-02.at.15.28.41.mov

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (42479d2) 82.60% compared to head (52c6b36) 82.60%.
Report is 1 commits behind head on main.

❗ Current head 52c6b36 differs from pull request most recent head c899874. Consider uploading reports for the commit c899874 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #34   +/-   ##
=======================================
  Coverage   82.60%   82.60%           
=======================================
  Files          28       28           
  Lines         460      460           
=======================================
  Hits          380      380           
  Misses         80       80           

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