test_standalone: fix TestSlapOSStandaloneLongSoftwareError

2^16 is too big and in many machines, you will have "Argument list too
long" error. Actually 2^16-1 is the limit and with the "echo "
characters in the beginning, we could do max "2^16 - 6". Using 2^15 is
already enough.
49 jobs for master in 0 seconds
Status Job ID Name Coverage
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