fix duplicate leaflet library filtered map

[thomas-topway-it]

• removes ext.srf.filtered.leaflet.js already included in ext.srf.filtered.js
• fixes markerClusterGroup
• fixes mapProvider disabled by this.options.hasOwnProperty('map provider dark')

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.22%. Comparing base (d8dd5d4) to head (459888f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #976   +/-   ##
=========================================
  Coverage     46.22%   46.22%           
  Complexity     2361     2361           
=========================================
  Files            80       80           
  Lines          9160     9160           
=========================================
  Hits           4234     4234           
  Misses         4926     4926           

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[krabina]

It works here https://test.knowledge.wiki/MapsTestFiltered1 but does not solve #974