Fixed dependency property name of property Groups in GalleryGroupFilter.
Fixed dependency property name of property Groups in GalleryGroupFilter.

fluentribbon/Fluent.Ribbon,fluentribbon/Fluent.Ribbon,Cubey2019/Fluent.Ribbon,robertmuehsig/Fluent.Ribbon,dady8889/Fluent.Ribbon,punker76/Fluent.Ribbon