test: fix missing test update 02

Author: bgwdotdev

examples/02-working-with-form-data/src/app.gleam

@@ -1,14 +1,15 @@
+import app/router
 import gleam/erlang/process
 import mist
 import wisp
-import app/router
+import wisp/wisp_mist
 
 pub fn main() {
   wisp.configure_logger()
   let secret_key_base = wisp.random_string(64)
 
   let assert Ok(_) =
-    wisp.mist_handler(router.handle_request, secret_key_base)
+    wisp_mist.handler(router.handle_request, secret_key_base)
     |> mist.new
     |> mist.port(8000)
     |> mist.start_http