Remove superfluous root_path from logging messages

[HansBrende]

Checklist

• The bug is reproducible against the latest release or master.
• There are no similar issues or pull requests to fix it yet.

Describe the bug

As per encode/starlette#1336, scope["root_path"] is never supposed to be joined to scope["path"], as the latter is supposed to be already prefixed with the former. Luckily uvicorn is never doing this except in logging. It is logging incorrect paths (according to ASGI spec) in the following places:

https://github.com/encode/uvicorn/blob/master/uvicorn/protocols/websockets/wsproto_impl.py#L256
https://github.com/encode/uvicorn/blob/master/uvicorn/protocols/websockets/wsproto_impl.py#L272
https://github.com/encode/uvicorn/blob/master/uvicorn/protocols/websockets/websockets_impl.py#L230
https://github.com/encode/uvicorn/blob/master/uvicorn/protocols/websockets/websockets_impl.py#L240
https://github.com/encode/uvicorn/blob/master/uvicorn/protocols/utils.py#L50

Steps to reproduce the bug

No response

Expected behavior

No response

Actual behavior

No response

Debugging material

No response

Environment

Running uvicorn 0.16.0 with CPython 3.8.10 on Darwin

Additional context

No response