ui: fix wizard dialog not displayed when no account exist

This situation occurs when starting Ring for the first time
and when every account are deleted.

Now we handle both of them by displaying the wizard for
creating an account.

Change-Id: Idf3018dcf407049327083d3738311bdc84dfa7ad
Tuleap: #1130
diff --git a/callwidget.h b/callwidget.h
index b56dd0d..4accbf9 100644
--- a/callwidget.h
+++ b/callwidget.h
@@ -53,6 +53,7 @@
     explicit CallWidget(QWidget* parent = 0);
     ~CallWidget();
     void atExit();
+    void findRingAccount();
 
 public slots:
     void contactButtonClicked(bool checked);
@@ -118,7 +119,6 @@
     constexpr static int qrSize_ = 200;
 
 private:
-    void findRingAccount();
     void setActualCall(Call* value);
     void placeCall();
     void setupOutOfCallIM();