Bug fix: Global default resource group was not being used by DefaultResourceProvider.
Bug fix: Global default resource group was not being used by DefaultResourceProvider.

OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI,OpenTechEngine/CEGUI,ruleless/CEGUI