selftests: net: Remove executable bits from library scripts

setup_loopback.sh and net_helper.sh are meant to be sourced from other
scripts, not executed directly. Therefore, remove the executable bits from
those files' permissions.

This change is similar to commit 49078c1b ("selftests: forwarding:
Remove executable bits from lib.sh")

Fixes: 7d157501 ("selftests/net: GRO coalesce test")
Fixes: 3bdd9fd2

 ("selftests/net: synchronize udpgro tests' tx and rx connection")
Suggested-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Benjamin Poirier <bpoirier@nvidia.com>
Link: https://lore.kernel.org/r/20240131140848.360618-4-bpoirier@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>