QmlDesigner: Remove refreshBindings for instance creation

Refresh bindings is very expensive and called anyway at reparenting.

Change-Id: I232afefee22484e3994ade31457f61ea6ee1293e
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
QmlDesigner: Remove unused code in anchors

Change-Id: I079eaebb933a8566b2391b7ea274ba6c3e4d36ce
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>