wgengine/magicsock: ignore pre-disco (pre-0.100) peers

There aren't any in the wild, other than one we ran on purpose to keep
us honest, but we can bump that one forward to 0.100.

Change-Id: I129e70724b2d3f8edf3b496dc01eba3ac5a2a907
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f