sync.profile: update module dependencies

qtwinextras contains optional QML types, so it optionally depends on
qtdeclarative, and has qtxmlpatterns and qtjsbackend as indirect
dependencies. Furthermore, use an empty string to use the same branch
under test.

Change-Id: I06180b7b523cf1b6c3c15764482e185433d5e32f
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>

sync.profile

@@ -3,5 +3,8 @@
 );
 
 %dependencies = (
-    qtbase => "refs/heads/stable"
+    "qtbase" => "",
+    "qtdeclarative" => "",
+    "qtxmlpatterns" => "",
+    "qtjsbackend" => "",
 );