userid no longer available in request.context

[tobi-or-not-tobi]

Describe the bug
When creating a fresh new svelte kit app, following https://kit.svelte.dev/docs#introduction-getting-started, the TODO page is not working in the newly generated app.

Logs

stack trace (In page)

```ts SyntaxError: Unexpected token T in JSON at position 0 ```

stack trace (terminal)

```shell Cannot read property 'userid' of undefined TypeError: Cannot read property 'userid' of undefined at get (/Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/src/routes/todos/index.json.ts:4:86) at render_route (file:///Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/node_modules/@sveltejs/kit/dist/ssr.js:1220:26) at processTicksAndRejections (internal/process/task_queues.js:97:5) at async render (file:///Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/node_modules/@sveltejs/kit/dist/ssr.js:1476:10) at async Object.handle (/Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/src/hooks.ts:14:24) at async respond (file:///Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/node_modules/@sveltejs/kit/dist/ssr.js:1450:10) at async fetch (file:///Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/node_modules/@sveltejs/kit/dist/ssr.js:703:24) Unexpected token T in JSON at position 0 SyntaxError: Unexpected token T in JSON at position 0 at JSON.parse () at Proxy. (file:///Users/I303733/Documents/GitHub/sandbox/sveltekit/my-app/node_modules/@sveltejs/kit/dist/ssr.js:762:22) at processTicksAndRejections (internal/process/task_queues.js:97:5) ```

To Reproduce

• svelte kit version: next
• svelte version: ^3.34.0
• app template: SvelteKit demo app
• TypeScript: Yes
• ESLint: Yes
• Prettier: Yes

Expected behavior
A working TODO page.

Information about your SvelteKit Installation:

Diagnostics

  System:
    OS: macOS 11.2.3
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 4.46 GB / 32.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 12.18.0 - /usr/local/bin/node
    Yarn: 1.22.4 - /usr/local/bin/yarn
    npm: 7.6.3 - ~/.npm/bin/npm
  Browsers:
    Brave Browser: 89.1.22.71
    Chrome: 90.0.4430.93
    Firefox: 87.0
    Safari: 14.0.3
  npmPackages:
    @sveltejs/kit: next => 1.0.0-next.99 
    svelte: ^3.34.0 => 3.38.2 
    vite: ^2.1.0 => 2.2.4 

• Your browser: chrome/macos
• Your adapter: n/a

Severity
Just anonying for starters, easy to fix.

Additional context

• The typescript code seems outdated, using the request.context.userid in a few places. This seems to be renamed to request.locals.userid.
• the inline comment // request.context.userid comes from src/hooks.js could also be reworded as it's a typescript file in this context