tstest/integration: make -verbose-tailscaled pass -verbose=2 to tailscaled

If you're using -verbose-tailscaled, you're doing in-the-weeds debugging,
so you probably want the verbose output.

Signed-off-by: Josh Bleecher Snyder <josh@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