adapt code to LRC API change

LRC API (Singleton's implementation) has changed.
This patch adapats the code to these changes.
Moslty changes deferencement '->' for direct access '.'

Tuleap: #44
Change-Id: Ic87b1306a1239fdb8a6af0affe1ecbc1d16f609c
diff --git a/src/ringwelcomeview.cpp b/src/ringwelcomeview.cpp
index 5f0186f..8c518e6 100644
--- a/src/ringwelcomeview.cpp
+++ b/src/ringwelcomeview.cpp
@@ -123,7 +123,7 @@
     }
 
     priv-> ringaccount_updated = QObject::connect(
-        AccountModel::instance(),
+        &AccountModel::instance(),
         &AccountModel::dataChanged,
         [label_explanation, label_ringid] () {
             /* check if the active ring account has changed,