tsweb: implement FlushError on loggingResponseWriter

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http.ResponseController.Flush prefers a FlushError method at each level
of the ResponseWriter wrapper chain and falls back to Flusher.Flush,
which can't report an error. loggingResponseWriter only had Flush, so
handlers using ResponseController to flush never saw the underlying
writer's flush errors, such as a stream reset by an expired write
deadline. Add FlushError that delegates via ResponseController so
errors from the wrapped writer propagate.

Updates tailscale/corp#48531

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: I259c5de234435f632387261165fe15dcaf34ff45

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