Fix gboolean/bool mixup

[bynect]

Followup to #1422.
Fixes #1421.

@dcermak could you try this on s390x?
This should be a general solution for all the values

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 58.33333% with 5 lines in your changes missing coverage. Please review.

Project coverage is 65.17%. Comparing base (381fd98) to head (13bff8a).

Files with missing lines	Patch %	Lines
src/dbus.c	28.57%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1423      +/-   ##
==========================================
+ Coverage   65.14%   65.17%   +0.03%     
==========================================
  Files          50       50              
  Lines        8718     8723       +5     
  Branches     1034     1034              
==========================================
+ Hits         5679     5685       +6     
+ Misses       3039     3038       -1     

Flag	Coverage Δ
unittests	65.17% <58.33%> (+0.03%)	⬆️

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