Setup accounts before setting up identities

Fixes #73

app/src/main/java/eu/faircode/email/ActivitySetup.java

@@ -35,7 +35,7 @@ import androidx.lifecycle.Observer;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 
 public class ActivitySetup extends ActivityBase implements FragmentManager.OnBackStackChangedListener {
-    boolean hasAccount;
+    private boolean hasAccount;
 
     static final int REQUEST_PERMISSION = 1;
     static final int REQUEST_CHOOSE_ACCOUNT = 2;

app/src/main/java/eu/faircode/email/FragmentSetup.java

@@ -144,6 +144,7 @@ public class FragmentSetup extends FragmentEx {
         pbAccount.setVisibility(View.GONE);
         pbIdentity.setVisibility(View.GONE);
         tvAccountDone.setText(R.string.title_setup_to_do);
+        btnIdentity.setEnabled(false);
         tvIdentityDone.setText(R.string.title_setup_to_do);
         tvPermissionsDone.setText(R.string.title_setup_to_do);
 
@@ -198,6 +199,7 @@ public class FragmentSetup extends FragmentEx {
             @Override
             public void onChanged(@Nullable List<EntityAccount> accounts) {
                 tvAccountDone.setText(accounts != null && accounts.size() > 0 ? R.string.title_setup_done : R.string.title_setup_to_do);
+                btnIdentity.setEnabled(accounts != null && accounts.size() > 0);
             }
         });