New test fails on non amd64 nor i386 platforms

[----------] 1 test from CtrlPayload
[ RUN ] CtrlPayload.parse
./qdlt/tests/test_dltctrlmsg.cpp:25: Failure
Expected equality of these values:
ctx.logLevel
Which is: '\xFF' (-1)
'\xff'
Which is: '\xFF' (255)

./qdlt/tests/test_dltctrlmsg.cpp:26: Failure
Expected equality of these values:
ctx.traceStatus
Which is: '\xFF' (-1)
'\xff'
Which is: '\xFF' (255)

[ FAILED ] CtrlPayload.parse (0 ms)
[----------] 1 test from CtrlPayload (0 ms total)

Introduced by @vifactor in https://github.com/COVESA/dlt-viewer/commit/63c4f8cedee7b216602fbdb97ba6a47ca34f7315

I don't yet know if this test exposes a real qdlt bug in library, or just a test that needs adjoustment for Big Endian platforms...