Remove query parameter from embedded replica url

[haaawk]

Otherwise replica fails with:

Error syncing database: sync error: failed to push frame: status=400 Bad Request, error={"error":"Protocol error: route not found: [\"?offline\", \"sync\", \"1\", \"1\", \"2\"]"}]

[haaawk]

It turns out offline sync works with url like libsql://testd-haaawk.turso.io but it does not work with a trailing slash like libsql://testd-haaawk.turso.io/:

╰──> export LIBSQL_SYNC_URL=libsql://testd-haaawk.turso.io/ 
╰──> cargo run --example offline_writes                    
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.60s
     Running `target/debug/examples/offline_writes`
Please write your entry to the guestbook:
test6
You entered: test6

Guest book entries:
  test

  tent

  test2

  test3

  test4

  test5

  test6

Syncing database to remote...
thread 'main' panicked at libsql/examples/offline_writes.rs:77:21:
called `Result::unwrap()` on an `Err` value: Sync(PushFrame(404, "{\"error\":\"route not found: [\\\"\\\", \\\"sync\\\", \\\"1\\\", \\\"9\\\", \\\"10\\\"]\"}"))
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I will have to make sure there's no trailing / in the url