fix(ext/node): fix TypeError in Buffer.from with base64url encoding. (#20705)

For the following example, if I set the encoding to `base64url`, it'll
throw an unexpected TypeError:

```ts
import { Buffer } from "node:buffer";

Buffer.from("IntcImhlbGxvXCI6XCJoZGQvZStpXCJ9Ig", "base64url").toString();

// error: Uncaught TypeError: src.subarray is not a function
// const buf = Buffer.from(
//                    ^
//     at blitBuffer (ext:deno_node/internal/buffer.mjs:1779:15)
//     at Uint8Array.base64urlWrite (ext:deno_node/internal/buffer.mjs:691:10)
//     at Object.write (ext:deno_node/internal/buffer.mjs:2195:11)
//     at Uint8Array.write (ext:deno_node/internal/buffer.mjs:794:14)
//     at fromString (ext:deno_node/internal/buffer.mjs:214:22)
//     at _from (ext:deno_node/internal/buffer.mjs:119:12)
//     at Function.from (ext:deno_node/internal/buffer.mjs:157:10)
//     at file:///Users/foodieats/temp/buffer1.ts:3:20
```

The error caused by `base64urlWrite` function, it should call
`forgivingBase64UrlDecode` not `forgivingBase64UrlEncode`

Also fixed #20563 .

1 files changed, 2 insertions, 2 deletions

diff --git a/ext/node/polyfills/internal_binding/_utils.ts b/ext/node/polyfills/internal_binding/_utils.ts
index ab174608b..00993732f 100644
--- a/ext/node/polyfills/internal_binding/_utils.ts
+++ b/ext/node/polyfills/internal_binding/_utils.ts
@@ -5,7 +5,7 @@
 
 import {
   forgivingBase64Decode,
-  forgivingBase64UrlEncode,
+  forgivingBase64UrlDecode,
 } from "ext:deno_web/00_infra.js";
 
 export function asciiToBytes(str: string) {
@@ -51,7 +51,7 @@ function base64clean(str: string) {
 export function base64UrlToBytes(str: string) {
   str = base64clean(str);
   str = str.replaceAll("+", "-").replaceAll("/", "_");
-  return forgivingBase64UrlEncode(str);
+  return forgivingBase64UrlDecode(str);
 }
 
 export function hexToBytes(str: string) {