Switch to private account on selecting to not use public location (#212)

Model/Accounts/AccountsModel.swift

@@ -54,6 +54,15 @@ final class AccountsModel: ObservableObject {
         )
     }
 
+    func configureAccount() {
+        if let account = lastUsed ??
+            InstancesModel.lastUsed?.anonymousAccount ??
+            InstancesModel.all.first?.anonymousAccount
+        {
+            setCurrent(account)
+        }
+    }
+
     func setCurrent(_ account: Account! = nil) {
         guard account != current else {
             return

Model/Accounts/InstancesModel.swift

@@ -14,7 +14,7 @@ final class InstancesModel: ObservableObject {
         return InstancesModel.find(id)
     }
 
-    var lastUsed: Instance? {
+    static var lastUsed: Instance? {
         guard let id = Defaults[.lastInstanceID] else {
             return nil
         }

Model/InstancesManifest.swift

@@ -31,7 +31,7 @@ final class InstancesManifest: Service, ObservableObject {
         guard let country = country else {
             accounts.publicAccount = nil
             if asCurrent {
-                accounts.setCurrent(nil)
+                accounts.configureAccount()
             }
             return
         }