Propagate the "--sudo" flag to the new compute detection widget

[psyhtest]

On one of my platforms, OpenCL programs only run under super user e.g.

# ck run program:arm-mali-sgemm

It used to be the case that OpenCL programs could be launched under normal user with the --sudo flag:

$ ck run program:arm-mali-sgemm --sudo

Not anymore. It appears that CK doesn't propagate the --sudo flag to the new widget for detecting the compute platform and devices (itself an OpenCL program).