vscode: Use options.base for update checking

See https://github.com/cdr/code-server/pull/2358#discussion_r529858749

ci/dev/vscode.patch

@@ -813,7 +813,7 @@ new file mode 100644
 index 0000000000000000000000000000000000000000..ead6a3cd5e98fdde074f19ee5043f152ed407146
 --- /dev/null
 +++ b/src/vs/server/browser/client.ts
-@@ -0,0 +1,240 @@
+@@ -0,0 +1,239 @@
 +import { Emitter } from 'vs/base/common/event';
 +import { URI } from 'vs/base/common/uri';
 +import { localize } from 'vs/nls';
@@ -967,8 +967,7 @@ index 0000000000000000000000000000000000000000..ead6a3cd5e98fdde074f19ee5043f152
 +
 +	const logService = (services.get(ILogService) as ILogService);
 +	const storageService = (services.get(IStorageService) as IStorageService);
-+	// We set this here first in case the path changes.
-+	const updateCheckEndpoint = path.join(window.location.pathname, '/update/check');
++	const updateCheckEndpoint = path.join(options.base, "/update/check")
 +	const getUpdate = async (): Promise<void> => {
 +		logService.debug('Checking for update...');
 +
@@ -1449,13 +1448,14 @@ new file mode 100644
 index 0000000000000000000000000000000000000000..0a4a91e5e36bda7f888feedda348aaff5fe32d27
 --- /dev/null
 +++ b/src/vs/server/ipc.d.ts
-@@ -0,0 +1,131 @@
+@@ -0,0 +1,132 @@
 +/**
 + * External interfaces for integration into code-server over IPC. No vs imports
 + * should be made in this file.
 + */
 +export interface Options {
 +	disableTelemetry: boolean
++	base: string
 +}
 +
 +export interface InitMessage {