[Layout] Trigger digest from mct-drag

Trigger digest using scope. during mct-drag
interactions, to ensure that changes which have
resulted from the drag are applied promptly.
WTD-535.

platform/commonUI/general/src/MCTDrag.js

@@ -15,6 +15,9 @@ define(
 
                 function fireListener(name) {
                     scope.$eval(attrs[name], { delta: delta });
+
+                    // Trigger prompt digestion
+                    scope.$apply();
                 }
 
                 function updatePosition(event) {