ConfigPropertyMap : load property default value associated with the property itself

Cyril Rossi requested to merge crossi/kdeclarative:pptymap_value_default into master

Sometime we need the property value and its default value to compute the property state isDefault, see plasma/kscreenlocker!18 (merged)

Simply load the default value with the property name suffixed with "Default".

Edited by Cyril Rossi

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