Fix thumbnail generation for SVG images when used as a Divio addon

[GaretJax]

Remove hardcoded settings from alrdryn_config.py and use the defaults provided by easy-thumbnails.

Fixes #1310

[codecov[bot]]

Codecov Report

Merging #1312 (b4edbfe) into master (0d974f9) will not change coverage. The diff coverage is n/a.

:exclamation: Current head b4edbfe differs from pull request most recent head 3d9bbce. Consider uploading reports for the commit 3d9bbce to get more accurate results

@@           Coverage Diff           @@
##           master    #1312   +/-   ##
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  Coverage   72.21%   72.21%           
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  Files          72       72           
  Lines        3239     3239           
  Branches      563      563           
=======================================
  Hits         2339     2339           
  Misses        734      734           
  Partials      166      166           

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[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.