fix(transport_ws): remove unnecessary noise from error message (IDFGH-14538)

[erkia]

A message reporting an error about esp_transport_read() prints contents of the buffer that was passed to this function. The contents of this buffer are irrelevant in the context of this message.

1. it can contain random, not NUL-terminated data from possibly partial read
2. it can contain data from previous esp_transport_write() call that is using the same buffer.

In either case this is just a noise:

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