ipn/ipnlocal: update profile on server sent profile changes

We were not updating the LoginProfile.UserProfile when a netmap
updated the UserProfile (e.g. when a node was tagged via the admin panel).

Updates #713

Signed-off-by: Maisem Ali <maisem@tailscale.com>

ipn/ipnlocal/profiles.go

@@ -126,6 +126,7 @@ func (pm *profileManager) SetPrefs(prefsIn ipn.PrefsView) error {
 		up.DisplayName = up.LoginName
 	}
 	cp := pm.currentProfile
+	wasNamedWithLoginName := cp.Name == cp.UserProfile.LoginName
 	if pm.isNewProfile {
 		pm.isNewProfile = false
 		cp.ID, cp.Key = newUnusedID(pm.knownProfiles)
@@ -135,6 +136,9 @@ func (pm *profileManager) SetPrefs(prefsIn ipn.PrefsView) error {
 	} else {
 		cp.UserProfile = ps.UserProfile
 	}
+	if wasNamedWithLoginName {
+		cp.Name = ps.LoginName
+	}
 	pm.knownProfiles[cp.ID] = cp
 	if err := pm.writeKnownProfiles(); err != nil {
 		return err