Handle correctly file uri icons

[bynect]

Came up in #1408

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 65.12%. Comparing base (162fc27) to head (e28a74c).

Files with missing lines	Patch %	Lines
src/icon.c	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1409   +/-   ##
=======================================
  Coverage   65.12%   65.12%           
=======================================
  Files          50       50           
  Lines        8654     8652    -2     
  Branches     1023     1023           
=======================================
- Hits         5636     5635    -1     
+ Misses       3018     3017    -1     

Flag	Coverage Δ
unittests	65.12% <0.00%> (+<0.01%)	⬆️

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