Double path unquote inside _TestClientTransport.__init__ method

[LowCostCustoms]

An unqote function called at this piece of code https://github.com/encode/starlette/blob/master/starlette/testclient.py#L314, causes the request path to be unquoted twice: firstly by the httpx.Request class, and then by a manual unquote function invocation over the httpx.Request.path property. This results in a discrepancy in the path processing rules between the mentioned and other transports, which could further lead to percent-encoded path parameters lost or corrupted in transition or worse: percent-encoding related bugs not caught by tests at all.

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