ethtool: T3871: honor the unsupported-driver denylist for flow-control too

Flow-control commits failed intermittently on virtio_net and similar
paravirtualized drivers: they support reading pause parameters but not
setting them, and that mismatch varies across kernel/QEMU versions.

The existing denylist for this already covered speed/duplex changes and its
name implied flow-control too, but nothing actually consulted it there - the
check relied solely on a live probe. The paired smoketest branched on that same
raw probe instead of the fixed capability check, so it missed the same drivers.

Assisted-by: Claude:claude-sonnet-5

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