
Regression from6d10655dc3
, which added UpdatePrefs but didn't write it out to disk. I'd planned on adding tests to state_test.go which is why I'd earlier added46896a9311
to prepare for making such persistence tests easier to write, but turns out state_test.go didn't even test UpdatePrefs, so I'm staying out of there. Instead, this is tested using integration tests. Fixes #2321 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>