Fix compilation when uart console is disabled (GIT8266O-648)

[pheki]

As CONFIG_ESP_CONSOLE_UART_BAUDRATE is undefined when UART is set to CONFIG_ESP_CONSOLE_UART_NONE, the SDK was failing to compile with an error here.

This PR fixes it by not modifying baud rate when UART's disabled, as there's no need to.

Thanks!

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[mriksman]

I'm having the same issue!