Fix faulty as vararg in set-constant scriptlet

Author: gorhill

assets/resources/scriptlets.js

@@ -436,14 +436,15 @@ function setConstantCore(
             return;
         }
         if ( extraArgs.as !== undefined ) {
+            const value = cValue;
             if ( extraArgs.as === 'function' ) {
-                cValue = ( ) => cValue;
+                cValue = ( ) => value;
             } else if ( extraArgs.as === 'callback' ) {
-                cValue = ( ) => (( ) => cValue);
+                cValue = ( ) => (( ) => value);
             } else if ( extraArgs.as === 'resolved' ) {
-                cValue = Promise.resolve(cValue);
+                cValue = Promise.resolve(value);
             } else if ( extraArgs.as === 'rejected' ) {
-                cValue = Promise.reject(cValue);
+                cValue = Promise.reject(value);
             }
         }
         let aborted = false;