Bug: websocket scope error

[yanyongyu]

According to asgi document, the websocket connection scheme should be ws or wss, but get http

This cause test failure for quart 0.15+/0.16+ (Error BadRequest)

async-asgi-testclient/async_asgi_testclient/websocket.py

Lines 115 to 123 in a86e577

	scope = {
	"type": "websocket",
	"headers": flatten_headers(headers),
	"path": path,
	"query_string": query_string_bytes,
	"root_path": "",
	"scheme": "http",
	"subprotocols": [],
	}

Reference: https://asgi.readthedocs.io/en/latest/specs/www.html#websocket-connection-scope

[masipcat]

Fix released in v1.4.9