[Fixed Position] Add stroke property

Add stroke property to Fixed Position toolbar for
borders, line color. WTD-881.

platform/features/layout/src/FixedController.js

@@ -193,6 +193,7 @@ define(
                     x: Math.floor(position.x / gridSize[0]),
                     y: Math.floor(position.y / gridSize[1]),
                     id: id,
+                    stroke: "transparent",
                     width: DEFAULT_DIMENSIONS[0],
                     height: DEFAULT_DIMENSIONS[1]
                 });