ci: tighten the test for adstool var
ci: tighten the test for adstool var

So far we have only tested if the adstool var command does not react to
our input with an error code. Well, maybe it is now time to compare if
the written values can be read back.

Signed-off-by: Patrick Bruenn <27dd71a6a4a167461f53ec06010a2a08d399a527@beckhoff.com>

Beckhoff/ADS,Beckhoff/ADS,Beckhoff/ADS,Beckhoff/ADS