Fix dependency of libiptux_test

[r-value]

iptux/IptuxResource.h in custom target iptux_resource_h is also required in making executable libiptux_test. Absense of this target in source array of libiptux_test (test_sources in meson.build) causes that compiling of cpp sources of libiptux_test may begin before target iptux_resource_h is built, which leads to build failure.

iptux/IptuxResource.h is included in iptux/AboutDialogTest.cpp

[codecov]

Codecov Report

Merging #495 (b99e9de) into master (b04aab4) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #495   +/-   ##
=======================================
  Coverage   44.52%   44.52%           
=======================================
  Files          68       68           
  Lines        7733     7733           
=======================================
  Hits         3443     3443           
  Misses       4290     4290           

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