Fix svg icons display issue in plugin list and plugin detail

[Xpirix]

• This PR is for the following issue: SVG is not loaded correctly on the website #65

Changes summary:

• Show SVG icons directly in the plugins list and the plugin detail page since solr-thumbnail doesn't support them

QuickOSM is an example of a plugin that uses an SVG icon:

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6d03c84) 36.94% compared to head (e0dc8e2) 82.68%.

Files	Patch %	Lines
qgis-app/plugins/templatetags/plugin_utils.py	50.00%	1 Missing ⚠️

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Additional details and impacted files

@@             Coverage Diff             @@
##           master     #348       +/-   ##
===========================================
+ Coverage   36.94%   82.68%   +45.73%     
===========================================
  Files         106      142       +36     
  Lines        4504     5503      +999     
===========================================
+ Hits         1664     4550     +2886     
+ Misses       2840      953     -1887     

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[Gustry]

Thanks @Xpirix ! 👍

[Xpirix]

My pleasure.