Bug: doesn't match wares containing base path

[talentlessguy]

Reproduction:

import { makeFetch } from 'https://deno.land/x/superfetch@1.0.6/mod.ts'

const app = new App()

app.use('/abc', (_req, res) => void res.end('Hello world'))
;(await makeFetch(app.handler)('/abc/def')).expectStatus(200).expectBody(
  'Hello world',
)
;(await makeFetch(app.handler)('/abcdef')).expect(404)