For config check, check that the selected binary is available.

[rdoeffinger]

pass being available is irrelevant if QtPass was configured to
use gpg for example.

[codecov]

Codecov Report

Merging #438 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@            Coverage Diff            @@
##           master    #438      +/-   ##
=========================================
- Coverage    7.23%   7.23%   -0.01%     
=========================================
  Files          41      41              
  Lines        2721    2722       +1     
=========================================
  Hits          197     197              
- Misses       2524    2525       +1

Impacted Files	Coverage Δ
src/util.cpp	8.19% <0%> (-0.14%)	⬇️

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[coveralls]

Coverage decreased (-0.06%) to 7.255% when pulling 2f39223 on rdoeffinger:checkconfig into f3b41ae on IJHack:master.