Fix dunstify icon and ids

[bynect]

fixing #1445

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.58%. Comparing base (80cc23d) to head (b73e2be).
⚠️ Report is 88 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1449      +/-   ##
==========================================
+ Coverage   65.57%   65.58%   +0.01%     
==========================================
  Files          50       50              
  Lines        8908     8911       +3     
  Branches     1042     1043       +1     
==========================================
+ Hits         5841     5844       +3     
  Misses       3067     3067              

Flag	Coverage Δ
unittests	65.58% <100.00%> (+0.01%)	⬆️

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[bynect]

@liskin is it okay now?

[liskin]

@liskin is it okay now?

The get/set id code looks okay now. Thanks!