Improve fix for set-constant conflict

Related commit:
- 2546f39568

assets/resources/scriptlets.js

@@ -746,6 +746,7 @@
         const odesc = Object.getOwnPropertyDescriptor(owner, prop);
         let prevGetter, prevSetter;
         if ( odesc instanceof Object ) {
+            if ( odesc.configurable === false ) { return; }
             if ( odesc.get instanceof Function ) {
                 prevGetter = odesc.get;
             }
@@ -808,7 +809,6 @@
                 return this.v;
             },
             setter: function(a) {
-                if ( a === this.v ) { return; }
                 this.v = a;
                 if ( a instanceof Object ) {
                     trapChain(a, chain);