fix(ext/http): truncate read bytes when streaming bodies (#14389)

stream shutdown wasn't happening correctly (moved it to call op_http_shutdown) & extra zeroed bytes were being sent for when body length not a multiple of 64*1024

ext/http/01_http.js

@@ -318,13 +318,13 @@
                 throw error;
               }
             }
+          }
 
-            try {
-              await core.opAsync("op_http_shutdown", streamRid);
-            } catch (error) {
-              await reader.cancel(error);
-              throw error;
-            }
+          try {
+            await core.opAsync("op_http_shutdown", streamRid);
+          } catch (error) {
+            await reader.cancel(error);
+            throw error;
           }
         }