CropUI : Fix activator for formatCenter plug.
CropUI : Fix activator for formatCenter plug.

johnhaddon/gaffer,ImageEngine/gaffer,appleseedhq/gaffer,johnhaddon/gaffer,ImageEngine/gaffer,GafferHQ/gaffer,boberfly/gaffer,andrewkaufman/gaffer,chippey/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,appleseedhq/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,boberfly/gaffer,chippey/gaffer,boberfly/gaffer,lucienfostier/gaffer,boberfly/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,lucienfostier/gaffer,hradec/gaffer,chippey/gaffer,andrewkaufman/gaffer,ivanimanishi/gaffer,ImageEngine/gaffer,chippey/gaffer,appleseedhq/gaffer,ivanimanishi/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,hradec/gaffer,GafferHQ/gaffer,ivanimanishi/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,hradec/gaffer,hradec/gaffer,johnhaddon/gaffer