Remove parentOriginHash checko

This fixes webviews from not working properly due to a change upstream.
Upstream added a check to ensure parent authority is encoded into the webview
origin. Since our webview origin is the parent authority, we can bypass this
check.

Index: code-server/lib/vscode/src/vs/workbench/contrib/webview/browser/pre/main.js
===================================================================
--- code-server.orig/lib/vscode/src/vs/workbench/contrib/webview/browser/pre/main.js
+++ code-server/lib/vscode/src/vs/workbench/contrib/webview/browser/pre/main.js
@@ -317,6 +317,12 @@ const hostMessaging = new class HostMess
 		const id = searchParams.get('id');
 
 		const hostname = location.hostname;
+
+		// It is safe to run if we are on the same host.
+		const parent = new URL(parentOrigin)
+		if (parent.hostname == location.hostname) {
+			return start(parentOrigin)
+		}
 
 		if (!crypto.subtle) {
 			// cannot validate, not running in a secure context