feat: exit with 1 when paused for is-paused

[cwrau]

That way the user can more easily use this in a script

instead of

if [[ "$(dunstctl is-paused)" == "true" ]]; then
  {...}
fi

they can do

if dunstctl is-paused -e; then
  {...}
fi

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.37%. Comparing base (d2faa87) to head (f213fa1).
⚠️ Report is 189 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1378      +/-   ##
==========================================
+ Coverage   65.34%   65.37%   +0.02%     
==========================================
  Files          50       50              
  Lines        8326     8321       -5     
  Branches     1001      999       -2     
==========================================
- Hits         5441     5440       -1     
+ Misses       2885     2881       -4     

Flag	Coverage Δ
unittests	65.37% <ø> (+0.02%)	⬆️

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