Prevent unwanted effects if setting invert on other than UART0 - only that has these flags defined and documented.

Author: dok-net

cores/esp8266/uart.cpp

@@ -657,7 +657,7 @@ uart_init(int uart_nr, int baudrate, int config, int mode, int tx_pin, size_t rx
     }
 
     uart_set_baudrate(uart, baudrate);
-    if(invert)
+    if(uart->uart_nr == UART0 && invert)
     {
         config |= BIT(UCDTRI) | BIT(UCRTSI) | BIT(UCTXI) | BIT(UCDSRI) | BIT(UCCTSI) | BIT(UCRXI);
     }