selftests: tc-testing: fix nat regex matching

In iproute 6.14, the nat ip mask logic was fixed to remove an undefined
behaviour[1]. So now instead of reporting '0.0.0.0/32' on x86 and potentially
'0

selftests: tc-testing: fix nat regex matching

In iproute 6.14, the nat ip mask logic was fixed to remove an undefined
behaviour[1]. So now instead of reporting '0.0.0.0/32' on x86 and potentially
'0.0.0.0/0' in other platforms, it reports '0.0.0.0/0' in all platforms.

[1] https://lore.kernel.org/netdev/[email protected]/

Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: Pedro Tammela <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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