Use correct path to test log to cat on error.

[iphydf]

This change is 

[codecov]

Codecov Report

Merging #1291 into master will increase coverage by 0.1%.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           master   #1291     +/-   ##
========================================
+ Coverage      83%   83.1%   +0.1%     
========================================
  Files          82      82             
  Lines       14957   14928     -29     
========================================
- Hits        12424   12420      -4     
+ Misses       2533    2508     -25

Impacted Files	Coverage Δ
toxcore/LAN_discovery.c	83% <0%> (-2.9%)	⬇️
toxcore/group.c	78.3% <0%> (-0.4%)	⬇️
toxcore/Messenger.c	86.7% <0%> (-0.1%)	⬇️
toxcore/DHT.c	77.8% <0%> (ø)	⬆️
toxcore/net_crypto.c	95.4% <0%> (+0.4%)	⬆️
toxav/toxav.c	68.5% <0%> (+1.7%)	⬆️
toxav/msi.c	66.7% <0%> (+2.7%)	⬆️

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