Fix StandardConfigurationContext to read the default property value from its ComponentNode instance

If an effective property value is not set, StandardConfigurationContext.getProperty(PropertyDescriptor property) reads the default property value from its parameter (property) instead of the ComponentNode instance. This results in faulty behavior when e.g. a controller service is enabled with its default settings and one or more of these default values differ from the default values of the supplied PropertyDescriptor.

A fix needs to be implemented to get the property descriptor and its default value from the component itself and not the supplied PropertyDescriptor parameter.