fixed settings opening twice from manage accounts activity

src/eu/siacs/conversations/ui/ManageAccountActivity.java

@@ -397,9 +397,6 @@ public class ManageAccountActivity extends XmppActivity {
 	@Override
 	public boolean onOptionsItemSelected(MenuItem item) {
 		switch (item.getItemId()) {
-		case R.id.action_settings:
-			startActivity(new Intent(this, SettingsActivity.class));
-			break;
 		case R.id.action_add_account:
 			addAccount();
 			break;