Ensure getter/setter are called with proper context

Related issue:
- uBlockOrigin/uAssets#9110

Related commits:
- gorhill/uBlock@e4b8f2e

Co-authored-by: Raymond Hill <rhill@raymondhill.net>

assets/resources/resources.txt

@@ -1704,13 +1704,13 @@ abort-current-inline-script.js application/javascript
 		get: function() {
 			validate();
 			return desc instanceof Object
-				? desc.get()
+				? desc.get.call(owner)
 				: value;
 		},
 		set: function(a) {
 			validate();
 			if ( desc instanceof Object ) {
-				desc.set(a);
+				desc.set.call(owner, a);
 			} else {
 				value = a;
 			}