UserSwitcherView: hide logout option if not logged in

Updates tailscale/corp#18202

Signed-off-by: kari-ts <kari@tailscale.com>

android/src/main/java/com/tailscale/ipn/ui/view/UserSwitcherView.kt

@@ -81,6 +81,7 @@ fun UserSwitcherView(
               SettingRow(viewModel.addProfileSetting)
               Lists.ItemDivider()
               SettingRow(viewModel.loginSetting)
+              if (currentUser != null){
                 Lists.ItemDivider()
                 SettingRow(viewModel.logoutSetting)
               }
@@ -88,3 +89,4 @@ fun UserSwitcherView(
           }
         }
   }
+}