texture-frame: Make borders construct properties
texture-frame: Make borders construct properties

parent-texture was already a construct property, make the border values
construct properties as well to match.

clutter-project/mx,clutter-project/mx,jonnylamb/mx,pwithnall/mx,jonnylamb/mx,pwithnall/mx,clutter-project/mx,jonnylamb/mx,jonnylamb/mx,pwithnall/mx,clutter-project/mx,pwithnall/mx