fixup! wrong import remove

Author: debadree25

lib/internal/webstreams/transformstream.js

@@ -5,6 +5,7 @@ const {
   FunctionPrototypeCall,
   ObjectDefineProperties,
   ObjectSetPrototypeOf,
+  PromisePrototypeThen,
   SymbolToStringTag,
   Symbol,
 } = primordials;