fix(es/helpers): Make _classPrivateFieldLooseBase return receiver (#6770)

Author: magic-akari

crates/swc_ecma_transforms_base/src/helpers/_class_private_field_loose_base.js

@@ -3,5 +3,5 @@ function _classPrivateFieldLooseBase(receiver, privateKey) {
     throw new TypeError("attempted to use private field on non-instance");
   }
 
-  return receiver[privateKey];
+  return receiver;
 }

packages/swc-helpers/src/_class_private_field_loose_base.mjs

@@ -3,5 +3,5 @@ export default function _classPrivateFieldBase(receiver, privateKey) {
     throw new TypeError("attempted to use private field on non-instance");
   }
 
-  return receiver[privateKey];
+  return receiver;
 }