ipn/ipnlocal: fix a log line having function pointers instead of values

Followup to using ipn.PrefsView (#6031).

Signed-off-by: Mihai Parparita <mihai@tailscale.com>

ipn/ipnlocal/local.go

@@ -2495,7 +2495,7 @@ func (b *LocalBackend) authReconfig() {
 	if err == wgengine.ErrNoChanges {
 		return
 	}
-	b.logf("[v1] authReconfig: ra=%v dns=%v 0x%02x: %v", prefs.RouteAll, prefs.CorpDNS, flags, err)
+	b.logf("[v1] authReconfig: ra=%v dns=%v 0x%02x: %v", prefs.RouteAll(), prefs.CorpDNS(), flags, err)
 
 	b.initPeerAPIListener()
 }