net/tstun: invoke conn25 app connector hook on injected reads

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The primary purpose is that return packets from the target app get
properly SNATed on connectors with --tun=userspace-networking, matching
the NAT behavior in the kernel tun path.

This is also necessary but not sufficient for clients of connectors in
userspace networking mode. The hook will DNAT MagicIPs, but won't
actually be sent MagicIPs until conn25 app connector DNS works with
userspace networking.

Fixes tailscale/corp#43201

Signed-off-by: Michael Ben-Ami <mzb@tailscale.com>

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