Fixing tagcloud issues due d3 v6 incompatabilities.

[YOUR1]

Makes the tag cloud work again.

TypeError: Cannot read properties of undefined (reading 'category20b')
    at jQuery.fn.init.wordcloud (ext.srf.formats.tagcloud.js:149:24)
    at jQuery.fn.init.<anonymous> (ext.srf.formats.tagcloud.js:236:23)
    at HTMLDivElement.loop (ext.smw.js:292:15)
    at loop (jquery.async.js:58:17)
    at jquery.async.js:29:4
    at $.whileAsync (jquery.async.js:41:4)
    at $.eachAsync (jquery.async.js:53:4)
    at $.fn.eachAsync (jquery.async.js:65:4)
    at Object.load (ext.smw.js:288:14)
    at ext.srf.formats.tagcloud.js:234:17

There was also an open PR on #978 but that had ALOT of changes which aren't necessary. This is minor.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.09%. Comparing base (63b4313) to head (15d4f07).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #981   +/-   ##
=========================================
  Coverage     45.09%   45.09%           
  Complexity     2422     2422           
=========================================
  Files            81       81           
  Lines          9196     9196           
=========================================
  Hits           4147     4147           
  Misses         5049     5049           

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[YOUR1]

Pinging @gesinn-it-ilm, since he was the original author of the D3 V6 update.