Remove unused .gitignore lines

These ignore built files that don't exist anymore, and just serve
to clutter up the .gitignore file. (I was initially confused when
I saw those lines, since I (correctly) thought that the only
Tailscale binaries were tailscale and tailscaled):

- taillogin was removed in d052586
- relaynode was removed in a56e853

Signed-off-by: Smitty <me@smitop.com>
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f