nixos/hostapd: escape interface names for hostapd
nixos/hostapd: escape interface names for hostapd

Same problem as described in acbadcdbba3e768a936c88e45a843bd72ecf247c.

When using multiple interfaces for wifi with `networking.wlanInterfaces`
and the interface for `hostapd` contains a dash, this will fail as
systemd escapes dashes in its device names.

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