Client-ID header missing when providing own ClientSession

[LostLuma]

When providing your own ClientSession for the client HTTPClient._init_session exits early and the Client-ID header will not be set on requests to Twitch, as it's set on the session instead of a per-request basis.

TwitchIO/twitchio/http.py

Lines 395 to 404 in 44c93a9

	async def _init_session(self) -> None:
	if self._session and not self._session.closed:
	return
	logger.debug("Initialising a new session on %s.", self.__class__.__qualname__)
	session = self._session or aiohttp.ClientSession()
	session.headers.update(self.headers)
	self._session = session

[github-actions]

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