p2p, bugfix: use NetPermissions::HasFlag() in CConnman::Bind()

PF_NOBAN is a multi-flag that includes PF_DOWNLOAD, so the conditional
in CConnman::Bind() using a bitwise AND will return the same result
for both the "noban" status and the "download" status.

Example:

`PF_DOWNLOAD` is `0b1000000`
`PF_NOBAN`    is `0b1010000`

This makes a check like `flags & PF_NOBAN` return `true` even if `flags`
is equal to `PF_DOWNLOAD`.

If `-whitebind=download@1.1.1.1:8765` is specified, then `1.1.1.1:8765`
should be added to the list of local addresses. We only want to avoid
adding to local addresses (that are advertised) a whitebind that has a
`noban@` flag.

As a result of a mis-check in `CConnman::Bind()` we would not have added
`1.1.1.1:8765` to the local addresses in the example above.

Co-authored-by: Vasil Dimov <vd@FreeBSD.org>

Github-Pull: bitcoin/bitcoin#21644
Rebased-From: dde69f20a01acca64ac21cb13993c6e4f8709f23

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