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 46.27%. Comparing base (96242db) to head (affee22).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #981      +/-   ##
============================================
+ Coverage     46.24%   46.27%   +0.02%     
  Complexity     2361     2361              
============================================
  Files            80       80              
  Lines          8957     8962       +5     
============================================
+ Hits           4142     4147       +5     
  Misses         4815     4815              

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[YOUR1]

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