update RingID/registered name on account selection

The welcome page now reacts to account selection and updates the
displayed name/id or hide it in case a SIP account is selected.

Change-Id: I4b78550906169a6c9dca5ccf29111182c5bd7160
Reviewed-by: Guillaume Roguez <guillaume.roguez@savoirfairelinux.com>

src/RingWindowController.mm

@@ -356,6 +356,9 @@ NSString* const kTrustRequestMenuItemIdentifier      = @"TrustRequestMenuItemIde
         [currentCallVC animateOut];
         [offlineVC animateOut];
     }
+
+    // Welcome view informations are also updated
+    [self updateRingID];
 }
 
 #pragma mark - NSToolbarDelegate