android/ui: fix exit node selection navigation (#344)

fixes tailscale/corp#19297

Selecting an exit node should navigate the user back home.

Signed-off-by: Jonathan Nobels <jonathan@tailscale.com>

android/src/main/java/com/tailscale/ipn/ui/viewModel/ExitNodePickerViewModel.kt

@@ -139,7 +139,7 @@ class ExitNodePickerViewModel(private val nav: ExitNodePickerNav) : IpnViewModel
     prefsOut.ExitNodeID = node.id
 
     Client(viewModelScope).editPrefs(prefsOut) {
-      nav.onNavigateBackToExitNodes()
+      nav.onNavigateBackHome()
       LoadingIndicator.stop()
     }
   }