android: don't show hex code yet

Hold off on showing the code until there is a place in the admin console for the user to input the code.

Updates tailscale/tailscale#13277

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

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

@@ -22,12 +22,16 @@ class LoginQRViewModel : IpnViewModel() {
 
   val numCode: StateFlow<String?> = MutableStateFlow(null)
   val qrCode: StateFlow<ImageBitmap?> = MutableStateFlow(null)
+  // Remove this once changes to admin console allowing input code to be entered are made.
+  val codeEnabled = false
 
   init {
     viewModelScope.launch {
       Notifier.browseToURL.collect { url ->
         url?.let {
           qrCode.set(generateQRCode(url, 200, 0))
+
+          if (codeEnabled) {
             // Extract the string after "https://login.tailscale.com/a/"
             val prefix = "https://login.tailscale.com/a/"
             val code =
@@ -37,6 +41,7 @@ class LoginQRViewModel : IpnViewModel() {
                   null
                 }
             numCode.set(code)
+          }
         }
             ?: run {
               qrCode.set(null)