tka: use ts_omit_tailnetlock in another spot, for ed25519consensus

I noticed this while modularizing clientupdate. With this in first,
moving clientupdate to be modular removes a bunch more stuff from
the minimal build + tsnet.

Updates #17115

Change-Id: I44bd055fca65808633fd3a848b0bbc09b00ad4fa
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
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