COMPMID-959: Number of threads was overwritten in benchmark_graph tests

RunExample would set the number of threads specified on the command line then the default graph config was overwriting it with the default hint.
Now the default config of the graph only sets the number of threads if explicitly requested by the user.

Change-Id: Ibc945e790abe8f16afd89e2a40cbe07bf0966e84
Reviewed-on: https://eu-gerrit-1.euhpc.arm.com/127301
Tested-by: Jenkins <bsgcomp@arm.com>
Reviewed-by: Pablo Tello <pablo.tello@arm.com>
2 files changed